Patent Publication Number: US-7908799-B2

Title: Wall blocks, wall block kits, walls resulting therefrom, and methods

Description:
FIELD OF THE DISCLOSURE 
     The present disclosure relates to wall blocks usable, for example, to create walls. The wall blocks are typically concrete, for example dry cast concrete. The blocks can be configured to be readily usable to create each of: mortarless retaining walls with set back; and, vertical walls without set back. Features providing for variability of block use are described. Also, wall block kits including multiple wall blocks of different size usable with one another to form each of: set back walls; and, vertical walls are described. Also, methods of manufacture and use are described. Further, selective advantageous wall block features are described. 
     BACKGROUND 
     Wall blocks usable to form mortarless walls with set back are well known. Examples are described for example in U.S. Pat. Nos. 5,795,105; 5,490,363; 5,704,183; and, 5,711,129, the complete disclosures of each being incorporated herein by reference. In general, when it is said that a wall block is configured for forming a mortarless wall with set back, it is meant that the wall block is configured to engage other analogous blocks with set back such that mortar is not needed to secure the blocks within the wall. An example system for providing such mortarless assembly is described for example in U.S. Pat. No. 5,704,183 and comprises a locator/receiver arrangement wherein: each block includes a locator or locator arrangement thereon, typically extending upwardly from an upper surface of the block, and oriented to be engaged by a receiver, typically oriented in a side and bottom of an adjacent block, when the adjacent block is positioned “on bond.” In the system of U.S. Pat. No. 5,704,183, for example, each block includes a locator on an upper surface and a pair of insets on opposite sides which extend through the block. When a block is oriented with an identical block in half-overlap, i.e., “on bond,” the protrusion on one block will extend into one of the insets of an identical block above the first block. Interference between the locator and the inset can be used to ensure that blocks in a second course above a first course, are positioned appropriately. 
     It is noted that in some instances a block that is to be used in a mortarless wall, is referred to as “mortarless wall block” or by similar terms. 
     The present disclosure relates to providing improvements in such blocks, for desired variability in use. 
     SUMMARY 
     According to the present disclosure, concrete wall blocks are described. The wall blocks include features such that the blocks can be used to form each of: a section of a wall (for example retaining wall) with set back; and, a section of a vertical (for example free-standing) wall. Example blocks are described which have first and second, opposite, faces that are defined as decorative, so that each type of wall formed with the blocks will be decorative. That is, the set back wall section will have a decorative front face; and, the vertical wall section will have opposite decorative faces. 
     Example blocks are described with features conveniently configured so that the blocks can be molded using a dry cast mold process, with a bottom of each mold cavity formed from a flat pallet upon which the blocks are seated when removed from the mold. 
     Also described are block sets, usable to provide variations in appearance of set back walls and vertical walls made with the blocks. 
     Methods of use and assembly are described. Also described are methods of palleting and block management; field modifications usable for selected wall features; and, methods of forming columns and corners using blocks of the type described, along with an identified corner block (in some instances with field modification). 
     Also described herein are advantageous features for wall blocks. These features can be implemented with additional features, to provide for the operations described above, or can be implemented in alternate types of wall blocks. 
     There is no specific requirement that a block, block set or method be practiced with blocks having all of the features described herein, in order to obtain some benefit according to the present disclosure. Further, there is no specific requirement that features be provided in the specific configuration, shape or size described and depicted, to possess functionality. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic perspective view of an example first wall block according to the present disclosure. 
         FIG. 2  is a schematic plan view taken toward a first bearing surface of the first wall block of  FIG. 1 ; the first bearing surface being a surface having a locator projection arrangement thereon. 
         FIG. 3  is a schematic first side elevational view of the first wall block of  FIGS. 1 and 2 . 
         FIG. 4  is a schematic cross-sectional view of the first wall block of  FIGS. 1-3 , taken generally along line  4 - 4 ,  FIG. 2 . 
         FIG. 5  is a schematic cross-sectional view of the first wall block of  FIGS. 1-3 , taken generally along line  5 - 5 ,  FIG. 2 . 
         FIG. 6  is an enlarged, schematic, fragmentary view of a selected portion of  FIG. 4 . 
         FIG. 7  is an enlarged schematic fragmentary view of a selected portion of  FIG. 5 . 
         FIG. 8  is an enlarged schematic fragmentary plan view of a portion of  FIG. 2 . 
         FIG. 9  is a top plan view of a portion of a first course in a vertical wall, without set back, made with two first wall blocks according to  FIG. 1 . 
         FIG. 10  is a top plan view of a portion of a vertical wall, without set back, made with first wall blocks according to  FIG. 1 ; in  FIG. 10  one of the blocks of  FIG. 1  being viewable positioned above the course of  FIG. 9 . 
         FIG. 11  is a schematic perspective view of an example second wall block according to the present disclosure. 
         FIG. 12  is a schematic plan view of a first bearing surface of the second wall block of  FIG. 10 ; the view being toward a bearing surface having a locator projection arrangement thereon. 
         FIG. 13  is a schematic plan view of a portion of wall course in a vertical wall, made using both first and second wall blocks in accord with  FIGS. 1 and 11 . 
         FIG. 14  is a schematic perspective view of an example third wall block usable to form a wall in accord with the present disclosure. 
         FIG. 15  is a schematic plan view of a first bearing surface of the third wall block of  FIG. 14 ; the view of  FIG. 14  being taken toward a first bearing surface having a locator projection arrangement thereon. 
         FIG. 16  is a schematic first side elevational view of the third wall block of  FIG. 14 . 
         FIG. 17  is a schematic perspective view of an example fourth wall block usable to form a wall in accord with the present disclosure. 
         FIG. 18  is a schematic plan view of the fourth wall block of  FIG. 17 ;  FIG. 18  being taken toward a first bearing surface comprising a surface having a locator projection arrangement thereon. 
         FIG. 19  is a schematic elevational view of an exposure face of a portion of a retaining wall with set back made with a kit of blocks including the blocks of  FIGS. 1 ,  11 ,  14  and  17 , according to the present disclosure. 
         FIG. 20  is a schematic, enlarged elevational view of a selected section of the wall of  FIG. 19 . 
         FIG. 21  is a schematic top plan view of the section of set back wall depicted in  FIG. 20 . 
         FIG. 22  is a schematic elevational view of one exposure face of a section of vertical wall without set back made using a kit of blocks including the blocks of  FIGS. 1 ,  11 ,  14  and  17 , according to the present disclosure. 
         FIG. 23  is an enlarged schematic view of a selected wall section of the wall portion of  FIG. 22 . 
         FIG. 24  is a schematic top plan view of the wall section of  FIG. 23 . 
         FIG. 25  is analogous to  FIG. 24 , with phantom lines showing selected hidden features. 
         FIG. 26  is a schematic side elevational view of a column made with wall blocks. 
         FIG. 27  is a schematic top plan view of a first block course for the column of  FIG. 26 . 
         FIG. 28  is a schematic top plan view of a second block course for the column of  FIG. 26 . 
         FIG. 29  is a schematic perspective view of a first block course for a second, alternate, column. 
         FIG. 30  is a schematic top plan view of a second course for the second, alternate, column. 
         FIG. 31  is a schematic top plan view of a first course for a third column. 
         FIG. 32  is a schematic top plan view of a second course for the third column. 
         FIG. 33  is a schematic perspective view of an inside of a corner of a wall section made at least in part with blocks according to the present disclosure. 
         FIG. 34  is a perspective view toward an outside of the corner of  FIG. 33 . 
         FIG. 35  is a schematic top plan view of one course of the corner of  FIGS. 33 and 34 . 
         FIG. 36  is a schematic top plan view of a second course of the corner of  FIGS. 33 and 34 . 
         FIG. 37  is a schematic top plan view of a wall section with setback, comprising three wall blocks in accord with  FIG. 1 ; in  FIG. 37  an upper wall block being depicted in phantom as positioned in half-overlap, on bond, relationship with adjacent wall blocks underneath. 
     
    
    
     DETAILED DESCRIPTION 
     I. General Features of Selected Example Wall Blocks According to the Present Disclosure 
     According to the present disclosure, wall block configurations are described. As will be understood from further description below, according to an aspect of the present disclosure, sets of blocks (for example including the blocks of  FIGS. 1 ,  11 ,  14 , and  17 ) are described herein. Each of the individual blocks of  FIGS. 1 ,  11 ,  14  and  17  has generally similar features. However the blocks are different in size from one another; the sizes being specifically selected to allow for preferred assembly into a selected wall configuration, if desired. 
     In general, wall blocks according to the present disclosure are configured to be usable in a vertical wall section, without set back between adjacent wall courses or layers, if desired. In addition, the wall blocks are configured to be usable in a wall section (set back wall section) with a set back between blocks in adjacent courses or layers, if desired. Features which provide for this will be understood from the general descriptions below. 
     In addition, wall blocks according to the present disclosure can be configured to provide for a decorative face having concave and convex sections. Further, wall blocks according to the present disclosure are shown in examples configured to provide, when desired, opposite exposed decorative faces, in a vertical wall. 
     In addition, kits or sets comprising a plurality of different sized walls blocks of appropriate sizes and features for interaction with other wall blocks are described, to provide for variation in the configuration and look of a wall section made with the wall blocks. The option between use of the blocks in a vertically oriented arrangement (without set back) with a lower block, or set back arrangement with a lower block, provides desirable variability, as described below. 
     Further, a feature is described for implementation in wall blocks according to the present disclosure, to facilitate removal of a locator arrangement, when desired, to facilitate fitting the wall blocks together, when a locator arrangement is not desired. 
     Further, advantageous features for use in wall blocks are characterized herein, that can be implemented in alternate wall blocks, usable independently of other features described herein, to advantage. 
     II. An Example Wall Block, FIGS.  1 - 8   
     In  FIGS. 1-8 , features of an example first wall block according to the present disclosure are provided. It is noted that there is no specific requirement that a wall block include all of the features described herein, in order to obtain some benefit according to the present disclosure. Further, there is no specific requirement that a wall block include features proportionally to the figures herein, in order to obtain some benefit. Variations in shape and size can be made, without varying from the general principles of the present disclosure. 
     Referring now to  FIG. 1 , a first wall block  1  is depicted. The first wall block  1  generally comprises a concrete wall block, intended for use to form a wall section. The wall block  1  can comprise, for example, a dry cast concrete block. 
     Referring to  FIG. 1 , block  1  generally comprises a block body  1   b  having first and second, opposite, bearing surfaces  4 ,  5 . As the term is used herein, a “bearing surface” is surface which is either directed upwardly or downwardly, in a wall section made with the block. Thus, the bearing surface provides a location where another block or block course above or below can engage when the wall block is used. Thus, in a typical orientation for use, one of the bearing surfaces  4 ,  5 , will be a top or upper surface; and, the opposite one of the bearing surfaces  4 ,  5  will be a bottom or lower surface. 
     As will be understood from description below, certain wall blocks according to the present disclosure include an optional feature allowing for the blocks to be selectively inverted relative to adjacent blocks in other courses, for example in a vertical wall section. Thus, the terms “top” and “bottom” only identify a surface as oriented in any given use. In the orientation generally shown in  FIG. 1 , bearing surface  4  is the top or upper surface and bearing surface  5  is a bottom or lower surface. Of course, as will be described below, in some wall sections, a block in accord with block  1  may be used inverted relative to the orientation of  FIG. 1 . 
     Referring to  FIG. 1 , the first bearing surface  4  has a locator arrangement  8  thereon. In the example block  1 , the locator arrangement is a locator projection arrangement comprising projection  8   p  projecting upwardly from a remainder of the surface  4 , indicated generally at  4   s . Although alternatives are possible, typically the remainder surface  4   s  is flat and unfeatured. The locator (projection) arrangement  8  is generally located in a central region of the bearing surface  4 , and can provide for selected set back engagement with a second block  1 , or an alternate sized or shaped block within a set or kit with which block  1  is used. This will be described further below. 
     It is noted that the example block  1 , the locator (projection) arrangement  8  comprises a single projection. In alternate applications the locator (projection) arrangement can comprise more than one projection. The overall shape of the locator arrangement  8  is a matter of choice, provided it serves the function as described below. 
     Although alternatives are possible, the opposite bearing surface  5  typically is a planar surface  5   s  generally free from any projection. This will be understood by reference to  FIG. 3 , a side elevation. Thus, typically bearing surface  5  is flat and planar, with no projecting features thereon. Thus, it will be a general characteristic of a typical wall block according to the present disclosure is that one bearing surface  4  has a locator (projection) arrangement  8  thereon, whereas the opposite bearing surface  5  is generally free from such structure. 
     Typically, the blocks  1  are configured so that the planar portion  4   s  of the first surface  4  is generally in a plane parallel with the opposite, second, bearing surface  5 . This facilitates block use in walls. 
     Referring, again, to  FIG. 1 , the wall block  1  has first and second, opposite, sides  10 ,  11 . The sides  10 ,  11  are often formed as mirror images of one another and typically extend, perpendicularly, between the bearing surfaces  4 ,  5 . Referring to  FIG. 1 , in the example block  1  depicted each of the sides  10 ,  11  includes an inset ( 13 ,  14  respectively) therein. Referring to inset  14  as an example, in the example block  1  depicted, each inset  13 ,  14  extends completely between the bearing surfaces  4 ,  5  and comprises a recess within the corresponding side  10 ,  11 . Thus, each inset  13 ,  14  has a most recessed wall  17 ; and, spaced, opposite, first and second recess sidewalls  18 ,  19 . 
     It is noted that each of the insets  13 ,  14 , is configured so that where it intersects the upper surface  4  a distance between the sidewalls  18  and  19  is greater, than at a location where the same inset intersects the second bearing surface  5 . The significance of this is described below. 
     Attention is now directed to  FIG. 2 , a plan view taken generally toward bearing surface  4 . Referring to  FIG. 2 , the dimension D 1  generally shows a dimension between opposite sides  18 ,  19  of the insets  13 ,  14 , where those insets  13 ,  14  intersect the first bearing surface  4 ; and, the dimension D 2  shows dimension across the insets  13 ,  14 , in a direction between the inset sidewalls  18 ,  19 , where those insets  13 ,  14 , intersect bearing surface  5 . 
     In general, D 1  is greater than D 2 . Typically, D 1  is at least 1.7×D 2 , and typically a value within the range of 1.7-2.5×D 2 , inclusive typically 1.9-2.2×D 2 , inclusive although variations are possible. The dimensions D 1  and D 2  are set in accord with respect to design/use principles discussed below. 
     Referring still to  FIG. 2 , the wall block  1  includes first and second, opposite, faces  20 ,  21 . When first wall block  1  is used in either a set back wall or vertical wall, generally face  20  will be an exposure face, i.e., a face exposed to a viewer of the wall looking toward the wall. In set back wall, opposite face  21  is generally not exposed to view, but rather is directed toward material retained by the set back wall, when the set back wall is used as a retaining wall. On the other hand, when block  1  is used in a vertical wall, especially in a free-standing vertical wall, face  21  will also be an exposure face, i.e., it will form a portion of a wall face viewable to a viewer on an opposite side of the wall from surface  20 . 
     In the example block  1  depicted, each of the faces  20 ,  21 , is a decorative face. The term “decorative face” as used herein as meant to refer to a face that has been designed to have an appearance distinguishing it from a simple planar face made from a concrete mixture. The particular decorative pattern on a given decorative face is typically a matter of choice. Decorative patterns are generally picked to appear attractive, when aligned with other decorative faces of block  1  or other blocks, in a wall section made with block  1 . Typically a decorative face  20 ,  21  is shaped to be contoured convex and concave portions for example, to appear as a section or natural rock. 
     It is anticipated that in a typical arrangement, the faces  20 ,  21 , will be molded into the blocks  1  when formed. That is, it is expected that typically the faces  20 ,  21  are molded faces, and are not cut or broken faces. Techniques for forming decorative molded faces have been described in U.S. Pat. Nos. 7,140,867 and 7,208,112, which are incorporated herein by reference. 
     Referring to  FIGS. 1 and 2 , it is noted that the decorative faces and the contours therein, are depicted in part defined by gridlines. These gridlines would not generally be observable in the sculpted face product, and are used in the figures to help depict contouring of the various drawings. 
     Referring to  FIGS. 1 and 2 , in general, each of the faces  20 ,  21 , extends (in height H) between the bearing surfaces  4 ,  5 , and also (in length or width L) between the sides  10 ,  11 . In typical blocks according to the present disclosure, the faces  20 ,  21 , will extend generally parallel to one another, and generally perpendicularly to the bearing surfaces  4 ,  5 . 
     Referring to  FIG. 2 , for the particular block  1  depicted, the sides  10 ,  11 , converge toward one another, in extension from face  20  toward face  21 . Preferably the angle of convergence X of each is the same, typically within the range of 3° to 12° and usually about 7.8°. 
     Herein the term “angle of convergence X” in this context, is meant to refer to an angle between associated ones of the sides  10 ,  11 , and a plane parallel to a direction of extension between the opposite faces  20 ,  21 . 
     It is noted that many of the features of the present disclosure can be obtained when the sides  10 ,  11  do not converge, but rather extend parallel to one another. However, the convergence provides advantageous features in set back walls made with blocks according to the present disclosure, relating to facilitating pivoting adjacent blocks to create curved surfaces. This general function from converging surfaces is also described for example in U.S. Pat. No. 5,062,610, which is incorporated herein by reference. 
     In addition, an angle of convergence X greater than 0° is desirable in vertical walls made with blocks according to the present invention, to key adjacent blocks to one another, as described below. 
     Further, it is noted that the angle of convergence X for each of the surfaces  10 ,  11 , will typically be the same. However alternates from them can be used in selected wall sections. Indeed modified blocks with respect to this are described herein below, in connection with some possible column arrangements and wall joints. 
     Attention is now directed in  FIG. 2  to locator arrangement  8 , again comprising a locator projection arrangement. The locator (projection) arrangement  8  has a first dimension DW thereacross in a direction generally perpendicular to a direction between the first and second faces  20 ,  21 ; and, a second dimension DL which generally corresponds to the length of the locator (projection) arrangement  8  in a direction extending between opposite sides  10 ,  11 . The first dimension DW is typically smaller than dimension D 2 . Typically DW=1.5-2.5 DL, usually about 2×DL, where DW is greatest width of locator (projection) arrangement  8 . Since the example locator (projection) arrangement  8 , as will be seen in  FIG. 3 , generally tapers downwardly in size from the surface  4   s  toward the upper tip  8   x , dimension DW ( FIG. 2 ) would typically be understood to be a widest dimension of locator (projection) arrangement  8 . DL ( FIG. 2 ) would be defined analogously. 
     The locator (projection) arrangement  8  typically is centrally positioned on bearing surface  5 . The sidewall  19  of the insets  13 ,  18 , which is furthest from the first, exposure, face  20  is located in a position so that when a second block corresponding to block  1  is positioned on a first block according to block  1  (in a head-to-head, half-overlap, on bond, orientation) depending on which half-overlap occurs, one of the surfaces  19  is positioned to abut the locator (projection) arrangement  8 , to define a selected specified set back. That is, the first wall block  1  is configured to be used to generate set back walls, for example retaining walls. The manner in which this is done is generally analogous to that described in patents U.S. Pat. No. 5,795,105, which concerns the use of the insets  13 ,  14 , in combination with a locator (projection) arrangement  8 . 
     In more general terms, block  1  can be said to have an engagement surface arrangement thereon. The engagement surface arrangement includes a feature allowing for engagement with the locator (projection) arrangement when a second block  1  is positioned below the block  1  in either of two possible half-overlap, on bond, orientations, relationships or engagements. Herein the term “half-overlap, on bond,” orientation and variants thereof is meant to refer to a positioning of two defined blocks, one above the other each having a first face  20  directed in the same direction, i.e., head-to-head, the upper block shifted to one or the other side of the lower wall block, in a half-overlap orientation with the upper block orientated with the engagement surface arrangement abutting the locator (projection) arrangement so that the defined set back occurs. A typical selected set back will be no greater than 1.0 inch (2.54 mm), usually no greater than 0.75 inch (19 mm); and, typically no greater than 0.5 inch (12.7 mm). The particular block  1  depicted in  FIG. 1 , as will be understood from discussion further below, is configured for a set back of 0.42 inch (10.7 mm) Typically, the set back will be configured to be at least 0.1 inch (2.5 mm). 
     Attention is now directed to  FIG. 3 .  FIG. 3  is a side elevational view of the block of  FIGS. 1 and 2 , generally taken toward side  10 . Thus, the inset  13  in side  10  is viewable schematically. It is noted that locator (projection) arrangement  8  is also viewable in side view, with sides extending upwardly at an angle to horizontal. The angle is typically within the range of 60°-80°, inclusive. 
     Referring to  FIG. 3 , attention is directed to the intersection of the inset  13  with the lower bearing surface  5 . Dimension D 2  defines a distance between front and rear surfaces  18 ,  19  of the inset  13  adjacent bearing surface  5 . Front wall  18  of the insert  13  is shown intersecting the lower bearing surface  5 , along edge  18 L. The wall  18  is referred to herein as a “front wall,” since it is the inset wall located closest to the exposure face  20 . At  191 , intersection between rear wall  19  of inset  13  with bearing surface  5  is depicted. Again, the location of  19 L is selected, relative to a rear edge  8   r  of locator (projection) arrangement  8  (opposite from edge  8   f ) such that when a locator (projection) arrangement  8  of a second block analogous to block  1  is positioned underneath block  1  in a half-overlap, on bond, configuration, the rear portion  8   r  of the locator arrangement on a lower block will engage the edge  19 L of the next upper block. In this manner, again, locator arrangement  8  operates as locator to achieve a selected, defined, set back. The other inset  14 , in side  11 , would be configured to operate analogously. 
     Attention is again directed to the locations  18 L,  19 L where the surfaces  18 ,  19  of the inset  13  intersect the lower bearing surface  5 . The distance between intersection  18 L and intersection  19 L is, again, generally represented as D 2 ,  FIGS. 2 and 3 . The distance D 2  is generally selected to be wider than dimension DW,  FIG. 2 , for ease of installation. Typically, it is selected to be sufficiently wider so that the block can be, positioned, in half-overlap, on bond, with an identical block, with the upper block rotated from a linear alignment with a lower block, in order to create arced walls (curving either inwardly or outwardly). For the example shown, the dimension D 2  is approximately 1-1.3×DW, inclusive. 
     Attention is now directed to dimension D 1 ,  FIG. 3 . Dimension D 1  is the dimension across a recess formed by the inset  13  between the opposite walls  18 ,  19 , where the walls  18 ,  19  intersect the bearing surface  4  having the locator (projection) arrangement  8  thereon. For example, inset wall  18  intersects surface  4  at  18 T, and wall  19 , intersects surface  4  at  19 T. The distance D 1  is generally selected to be sufficiently larger than dimension DW,  FIG. 2 , so that two effects are achieved:
         (1) when block  1  is positioned inverted, i.e., with bearing surface  14  directed downwardly, on a second block  1  that is not inverted (i.e., with a locator (projection) arrangement  8  projecting upwardly) in each of two head-to-head vertical (half-overlap, on bond) relationships the locator (projection) arrangement  8  on the lower block projects upwardly into an inset ( 13 ,  14 ) on the upper block and a locator (projection) arrangement  8  on the upper block projects into an inset of the lower block; and,   (2) when block  1  is positioned inverted, i.e., with bearing surface  4  directed downwardly, with a second block  1  that is not inverted (i.e., has a locator (projection) arrangement projecting upwardly) in either of two a head-to-toe vertical (half-overlap, on bond) relationships the locator (projection) arrangement  8  on the lower block projects upwardly into an inset ( 13 ,  14 ) on the upper block, and the locator (projection) arrangement  8  on the upper block projects into an inset on the lower block.       

     This capability generally allows a block  1  (that is usable in a section of a set back wall) to also be used in a section of a vertical wall. This is described farther below. Herein, when it is said that two blocks are oriented in “head-to-head” orientation (relationship or engagement), or by similar terms, it is meant that the first face  20  of one is directed in the same general direction as the first face  20  of the other. When it is said that this occurs in a “half-overlap, on bond” relationship, engagement or orientation, an analogous definition to that previously used is meant. When it is said that two adjacent blocks are oriented in “head-to-toe” relationship (orientation or engagement) to one another, or by similar terms, it is meant that the first face  20  of 1 is generally directed generally oppositely of the first face  20  of the other. 
     Herein, when two blocks are oriented with a first bearing surface of one engaging a first bearing surface of the other, they are sometimes characterized as being in a “first bearing surface-to-first bearing surface” relationship, orientation or engagement. Analogously, when two blocks are oriented with a second bearing surface of one engaging the second bearing surface of the other, it may characterized as being in a “second bearing surface-to-second bearing surface” orientation, engagement or relationship. 
     In general terms, block  1  can be said to have a recess arrangement in the first bearing surface and a engagement surface arrangement. The engagement surface arrangement operates, in combination with an appropriately positioned locator (projection) arrangement  8  on a vertically adjacent block in the set back wall or wall section, to define a set back. In the example block  1  depicted, the engagement surface arrangement comprises a location where insets  13 ,  14 , intersect surface  5 . The recess arrangement provides for receipt therein of a locator (projection) arrangement  8  on an adjacent block  1  in inverted relationship to bearing surface  4  (directed toward bearing surface  4 ) in any of two possible half-overlap, on bond orientations, in each of head-to-head or head-to-toe orientations. The recess arrangement for the example block  1 ,  FIG. 3 , is located generally at dimension D 1 ,  FIG. 3 , and for example comprises where the insets  13 ,  14  intersect surface  4   s.    
     It should be understood that the above described capabilities can be accomplished with a wide variety of locator (projection) arrangement, engagement surface arrangement and recess arrangement configurations and combinations. For example: the locator (projection) arrangement can comprise a single projection or a plurality of projections; the engagement surface arrangement can comprise part of an inset that extends completely through the block, or can comprise an appropriately positioned recess in surface  5 ; and, the recess arrangement can comprise part of an inset that extends completely through the block  1 , or it can be a recess arrangement in bearing surface  4 . Herein, in the examples depicted, the engagement surface arrangement and recess arrangement together comprise insets extending completely through a block in a direction between the two bearing surfaces,  4 ,  5 , since such a configuration can be conveniently molded with techniques characterized herein below. 
     Still referring to  FIG. 3 , it is noted that the particular inset  13  depicted (of which inset  14  is a mirror image) is generally v-shaped, with a wider portion at the top and a narrow portion at the bottom. This configuration is particularly convenient for molding with techniques according to the description below. However, alternate configurations can be used. For the particular inset  13  depicted in  FIG. 3 , adjacent surface  14 , the slant of the opposite sides  18 ,  19 , away from one another, is depicted as modified. This will typically be acceptable, if the block is molded as described below, as long as the walls  18 ,  19  are not turned back towards one another as they extend upwardly, since this would create potentially difficult mold undercut. 
     Attention is now directed to  FIG. 4 , a schematic cross-sectional view taken generally along line  4 - 4 ,  FIG. 2 . The cross-sectional view is basically through a center of block  1 , in a plane extending between the first decorative surface  20  and the opposite second decorative surface  21 . In  FIG. 4 , a cross-sectional view of locator (projection) arrangement  8  is provided. An enlarged fragmentary view of the cross-section of locator  8  is viewable in  FIG. 6 . Referring to  FIG. 6 , it can be seen that the locator (projection) arrangement  8  includes a sidewall  8   s  which tapers inwardly (typically at an angle to horizontal within the range of 60°-80°, inclusive) for example 70° in extension upwardly from a base at  8   b , to the top  8   x . Surrounding the locator (projection) arrangement  8  is provided a recess trough  8   t . The recess trough is typically at least 0.02 inch (0.5 mm) deep, usually within the range of 0.02 to 0.1 inch (0.5-2.54 mm) deep. The trough  8   t  facilitates removal of the locator arrangement  8  in the field, if desired for the particular wall construction being made. That is, using a chisel or other tool, locator  8  can be sufficiently removed so that any residual portion thereof does not project above surface  4 , to advantage. 
     It is noted that the presence of the trough  8   t  surrounding locator projection arrangement  8  provides additional advantage. First, as will be understood from descriptions below, in a typical process for formation of the block  1 , a pressure plate is brought down into a mold, to generate surface  4  and locator projection arrangement  8 . When the pressure plate is configured to also form trough  8   t  (around any projection arrangement in the locator projection arrangement  8 ) it has been observed that the definition of the locator projection arrangement tends to be more consistent to the desired configuration, with less rupture or imperfection. Further, during engagement between the locator projection arrangement  8  and the engagement surface arrangement of a next upper block, in a setback wall section, the next upper block will slide across the trough  8   t , and engage locator projection arrangement  8  in a slanted surface portion thereof that does not include the lower radius, and is a more sharply and precisely defined portion of the locator projection arrangement  8   t.    
       FIG. 5  is a cross-sectional view taken generally along line  5 - 5 ,  FIG. 2 . In  FIG. 6 , the cross-sectional view is being taken in the orientation depicted by the arrows on line  6 - 6 ,  FIG. 2 ; i.e., orthogonal to the view of  FIG. 4 . In  FIG. 6 , the locator arrangement  8  is shown in cross-section. In  FIG. 7 , an enlarged fragmentary view of a portion of  FIG. 5 , is depicted and trough  8   t  can again be seen surrounding the locator (projection) arrangement  8 . 
     In  FIG. 8 , an enlarged schematic, fragmentary, view of an indicated portion of  FIG. 2  is depicted. Here the locator (projection) arrangement  8  can be seen positioned between the opposite insets  13 ,  14 . 
     In general, a block having features in accord with  FIGS. 1-8  can be manufactured using variations in conventional block manufacture. The blocks are particularly configured for manufacture in accord with dry cast concrete methods, although many of the same features can be incorporated in blocks manufactured using wet cast approaches. 
     For a dry cast approach, typically the mold is configured with a mold cavity defined in part by a movable bottom plate or pallet, formed with a flat and featureless upper surface. The mold cavity would include first and second, opposite, movable, mold cavity sides having sculpted or molded surfaces configured to form the opposite decorative faces  20 ,  21 . The sculpted mold surfaces can be made using techniques in accord with U.S. Pat. Nos. 7,140,867 and 7,208,112, for example. The movable walls would generally be configured in the mold to be pivoted away (or otherwise be drawn away) from the sides of the wall block, once formed in the mold cavity, so that block and pallet can be lowered without damage to the decorative wall surfaces  20 ,  21 . 
     The mold cavity would also include sides configured to form the opposite sidewalls  10 ,  11  of the wall block  1 ; these sides including appropriate features therein for formation of the insets  13 ,  14 . These walls would typically not be movable. 
     The upper end of the mold cavity would be closed by a pressure plate, or stripper. The pressure plate would typically be flat with an appropriate central feature for formation of the locator (projection) arrangement  8 ; and, if used, the trough  8   t.    
     In operation, the movable pallet would be brought into the bottom of the mold, to close the lower part of the mold cavity. The pivotable or movable side pieces would also be positioned in a manner closing the mold cavity. Dry cast concrete, in accord with a mix desired for the intended operation, would be poured into the mold, and the mold would be shaken. The upper pressure plate or stripper would then be pressed against the upper surface of the concrete mix, to compress the mix in the mold and conform it to the mold features. While this pressure is being applied, the locator (projection) arrangement  8  and trough  8   t  would be formed in the upper surface. Of course, this would also provide the decorative faces  20 ,  21 , in the sides. 
     After the compression step is complete, the sidewalls used to form the decorative surfaces  20 ,  21 , can be moved or pivoted out of the way, and the lower pallet can be dropped, or the mold raised, to free the block from the mold cavity. 
     While resting on the pallet, the block can be allowed to dry, and then be moved into curing operation. 
     The molding operation can be conducted in a block making machine configured to form more than one block on the pallet, at the same time, by having multiple mold cavities positioned over the same pallet. In a single block making machine, more than one size or shape of block can be formed, if desired. 
     The first wall block  1 ,  FIG. 1 , can be provided with a variety of general dimensions. In an example system described herein, the block is provided with a first surface  20  that is 16 inches (406 mm) long (or wide, see dimension L) and 6 inches (152 mm) high (see dimension H); and an opposite surface  21  which is 14 (356 mm) inches long (or wide L) and 6 inches (152 mm) high (H). Lengths (T) of the flat portion of the surfaces  4 ,  5 , would typically be the same, in extension between the surfaces  20 ,  21 . In a typical block T would be 9.5 inches (241 mm). The sculpted portions of the surfaces  20 ,  21  would typically each add an additional 0.75 inch (19 mm) to the size of the block, to dimension T, providing a total dimension of 11 inches (279 mm). The unit weight would be about 64 pounds (29 kg.). 
     As described herein below, the block  1  is configured to be used as part of a block set, including alternate blocks. However, the block  1  can be used to form each of: (1) a set back wall (for example, in a retaining wall); and (2) a section of a vertical wall (for example, for a free-standing wall) on its own. 
     The use of block  1  to form a set back wall, is generally in accord with typical mortarless, set back, retaining wall construction for example as described in U.S. Pat. No. 5,062,610. 
     An example wall section with setback, made with block  1 , is schematically in  FIG. 37 . Referring to  FIG. 37 , typically, a first course  30  of blocks  1  is positioned with the blocks  1  adjacent one another and head-to-head, see blocks  31 ,  32 ,  FIG. 37 . This wall section can be straight or curved (inwardly or outwardly) as desired. The next course  33  will be positioned above this first course, in half-overlap, on bond, i.e., with each block  34  in the second course in half-overlap with each of two adjacent blocks  31 ,  32  in the lower course. 
     In the depiction of  FIG. 37 , the upper block  33 , positioned in half-overlap, on bond, setback relationship with the lower blocks,  31 ,  32 , is depicted in phantom. Referring to  FIG. 37 , it is noted that the total amount of setback (indicated generally herein by the designation S) is less than an amount by which the decorative faces  20  project forwardly from the bearing surfaces  4 . This provides for an attractive decorative appearance in the wall, with setback not clearly exposing to view flat portions of bearing surface  4 . In the example depicted in  FIG. 37 , the setback is about 0.42 inches (10.7 mm), and the amount of projection of the decorative portion  20  forward from the bearing surface  4  is about 0.75 inch (19.1 mm). 
     In a set back wall, the relationship between two adjacent, vertically exposed, blocks  1  will typically be head-to-head, i.e., with the first face  20  of each extending in generally the same direction, although as described above, some curvature between the two is possible. The set back would be accomplished by applying each block in the upper course in a manner such that the locator (projection) arrangement  8  in each lower block is positioned projecting into an inset of two upper blocks, abutting the forward walls of the insets. Typically, in a setback wall (using blocks in accord with  FIGS. 1 and 2 ), specifically in a retaining wall section with set back, the exposure face of the retaining wall will correspond to the larger decorative face, i.e., face  20 , of each block. Herein the term “exposure face,” when used in connection with a retaining wall, or block feature in a retaining wall, is meant to refer to the face of the block toward a viewer observing the retaining wall. When the blocks are analogous to block  1 , to have one longer decorative face  20  and one shorter decorative face  21 , the blocks are orientated to be used in a set back retaining wall with the longer face  20  being implemented in the exposure face, i.e., directed toward the viewer 
     As indicated, wall block  1  is also configured for use to provide a vertical, for example free-standing, wall. Such a wall has no set back and is typically not used for a retaining. With respect to formation of such a wall, attention is directed to  FIGS. 9 and 10 . 
     A free-standing vertical wall section made only with a block according to  FIG. 1 , would generally be constructed as follows. A first course or base would be constructed by positioning blocks  1  according to  FIG. 1  adjacent one another (head-to-toe) in a row. Thus each alternate block in the row would be rotated 180°, relative to adjacent blocks. This is shown for example in  FIG. 9 . Thus, block  1   a  is positioned with face  20  in a first direction, and adjacent block  1   c  is positioned with face  20  directed in an opposite direction. Blocks  1  are snug up against one another, with abutting sides, to form a straight line. The straight line results because the angle of convergence X ( FIG. 2 ) of each sidewall  10 ,  11 , is the same. Of course in some applications, the angles can be modified, for example field modified, to cause a curve or turn in the wall. 
     It is noted that in a row of blocks organized as shown in  FIG. 9 , any of blocks  1  positioned between two adjacent blocks, will generally be keyed in positioned, with respect to movement in the direction of a face  21  thereon, due to the angled interface between adjacent blocks. This will help provide integrity to the wall, and facilitate installation. 
     It is noted that in the wall section or course portion depicted in  FIG. 9 , blocks  1   a ,  1   c , i.e., adjacent blocks  1 , are oriented with the exposure faces ( 20 ,  21 ) on each side of the wall, generally in the alignment (i.e. same approximate plane). 
     A next course or layer, can be positioned on top of the base layer using block  1 . With respect to this, attention is directed to  FIG. 10 . Here an above block  1   d  in the next course, is shown inverted relative to the lower course comprising blocks  1   a  and  1   c ; i.e., in one course, the first course comprising blocks  1   a  and  1   c , the blocks  1   a  and  1   c  are oriented with surfaces  4  (having locator (projection) arrangement  8  thereon) directed upwardly. In the next adjacent course, in this instance a course comprising block  1   d , the block  1   d  is orientated with bearing surface  4 , having the locator (projection) arrangement  8  thereon directed downwardly. It can be seen that the locator (projection) arrangements  8  in the lower blocks will generally project up into insets (recesses) on blocks of the upper course; and, the locator (projection) arrangement  8  on the upper block  1   d  would project downwardly inset (recesses) definition provided in the lower course comprising blocks  1   a  and  1   c . This is a vertical wall, and thus it has no set back. Of course, block  1   d  can be rotated (in the plane of the drawing of  FIG. 10 ) 180° and still be positioned appropriately. Thus, block  1   a  is positioned “head-to-toe” with respect to block  1   c . Block  1   d , on the other hand, is positioned in head-to-head with respect to block  1   a , and head-to-toe with respect to block  1   d.    
     Referring to  FIG. 10 , the relationship between block  1   d  and each one of blocks  1   a  and  1   c , can be characterized as a “first bearing surface-to-first bearing surface” engagement, relationship or orientation. 
     Still referring to  FIG. 10 , it can be seen that a vertical wall with no set back constructed in accord with the principles described herein in connection with  FIG. 10  will be a vertical wall having opposite exposure faces that are formed from decorative faces  20 ,  21  of the individual blocks  1 . Thus a wall formed in accord with the description of  FIG. 10  would be usable, for example, as a decorative free-standing wall. It is noted that typically in the construction of such a free-standing wall, masonry glue will be used in adjoining faces of vertically adjacent blocks. Also, typically the next (third) course up would comprise blocks each oriented with the locator (projection) arrangement directed upwardly. This would be a “second bearing surface-to-second bearing surface” engagement, relationship or orientation. Typically, in each course adjacent blocks will be positioned at head-to-toe, as the term is used herein. 
     It is noted that in some instances, it may be desirable to remove a locator (projection) arrangement  8  from a block, to facilitate the wall construction. This can be accommodated by chiseling out the locator (projection) arrangement as previously described. 
     It is also noted that in some instances it may be desirable to introduce more variability into the decorative surfaces or exposure surfaces of a wall, by using alternately sized or appearing blocks. Blocks to accommodate this as described in the following sections. Also, in later sections methods for creating corners and/or columns are described. 
     III. Additional Wall Blocks Useable, for Example in a Wall Block Set or Kit Including Wall Block 
     In some instances, it may be desirable to provide for greater variability in a set back wall section or a vertical wall section constructed using wall block  1 ,  FIGS. 1-8 . This can be accomplished by generating a wall block kit which includes one or more additional blocks of different size, each configured in accord with analogous principles. Example blocks that can be used in such a wall block are described in this section. 
     A. An Example Second Wall Block,  FIGS. 11-12   
     Attention is now directed to  FIGS. 11-12 . In  FIGS. 11-12 , a second wall block usable in association with wall block  1 ,  FIGS. 1-8 , to form either or both of a wall block section of a set back wall and a wall section of a vertical wall, is depicted. Attention is first to  FIG. 11 , a perspective view of a second wall block  50 . The second wall block  50  includes general features analogous to wall block  1 ,  FIG. 1 . However block  50  is configured in a different size. 
     Referring to wall block  50 , the wall block  50  comprises a block body  50   a  and includes a first bearing surface  54  which, when the block is positioned in the orientation of  FIG. 1  is a top or upper surface; and, a second, opposite, bearing surface  55 . Typically, the second bearing surface  55  is flat and featureless, although alternatives are possible. The first bearing surface  54  includes a locator arrangement  58  thereon, in the example depicted comprising a locator projection arrangement. The example locator (projection) arrangement  58  is surrounded by a trough  58   t , analogous to trough  8   t ,  FIG. 2 . Wall block  50  includes first and second, opposite, block sides  60 ,  61 ; the sides  60 ,  61  including insets  63 ,  64  respectively therein. 
     Analogously to insets  13  and  14 , insets  63  and  64  each include a most recessed wall  67 ; a first sidewall  68 ; and, a second sidewall  69 . Also, analogously to wall block  1 ,  FIG. 1 , wall block  50  includes a first, exposure, face  70  and a second, opposite, face  71 . 
     Although alternatives are possible, block sidewalls  60 ,  61  converge in extension from face  70  to face  71 , and are typically each planar. In the example, each block sidewall  60 ,  61  extends an angle of convergence X, see  FIG. 12 , a top plan view of block  50 . This would typically be selected to the same for each sidewall  60 ,  61  as the angle of convergence X for each sidewall of block  1 , when block  60  is to be used in a set with block  1 , although alternatives are possible. 
     Still referring to  FIG. 12 , it is noted that each of the insets  63 ,  64  has a first dimension thereacross, between sidewalls  68 ,  69 , indicated at D 1 , where the insets  63 ,  64  intersect the first bearing surface  54 ; and, a second dimension D 2  between the wall  68 ,  69 , where the insets  63 ,  64  intersect the lower second bearing surface  55 ; with D 1  greater than D 2 . Typically, D 1  and D 2  would selected in the same manner as described for the wall block  1 , when the wall block  1  is to be used with wall block  50  as a set. 
     A side elevational view of block  50  is not depicted, as it would appear generally similar to the side elevational view of block  1 ,  FIG. 3 . Indeed the same dimension of insets  63 ,  64 , can be used in the two blocks  1 ,  50 , with the exception that the insets of block  50  are shallower in depth inwardly from the sidewalls  60 ,  61 , than are the insets of block  1 , for the reason that, as described below, the block  50  is smaller in dimension between the sidewalls  60 ,  61  than is block  1 . 
     However, block  50 , although configured with overall features analogous to block  1 , is different in size. First, the block  50  provides for approximate half the exposure face area when used. Thus, for example, face  70  for the example described block  50 , would be the same height (H) but half as wide (long L) as the corresponding surface in block  1 . The example block  50  described herein, would have a first surface  70  having a dimension H about 6 inches (152 mm) high and about 8 (203 mm) inches wide (long dimension L). 
     For such a block, the opposite face  71  would typically have a dimension 6 inches (152 mm0 by 6 inches (152 mm). The depth of the block  50 , i.e., distance between the outermost portions the decorative surfaces  70 ,  71  would also be about the same as block  1 , i.e., 11 inches (279 mm). For the examples described, a distance T ( FIG. 12 ) in a direction between the exposure face  70 ,  71 , across the flat portion of surface  54 , would be 9.5 inches (241 mm), and the contour faces  70 ,  71 , when used, would each adding an extra 0.75 inch (19 mm) total to the length. 
     Such a block would have a weight of about 30 pounds (13.6 kg), and would be configured for a wall unit batter (angle of set back) of 4°. 
     Another difference between block  50  and block  1  relates to the overall size of the locator (projection) arrangement  58 . While the locator (projection) arrangement  58  would typically project upwardly the same amount as locator projection arrangement  8 , locator projection arrangement  58  would typically be smaller in length, i.e., in direction between the two insets  63 ,  64 , while having approximately the same distance thereacross the width, i.e., distance in a direction between the faces  70 ,  71 . 
     Again, generally the cross-dimensions D 1 , D 2  of the insets, i.e., dimensions between the first and second walls  69 ,  69  adjacent the opposite bearing faces  54 ,  55 , would be determined analogously to the same distances in block  1 . Adjacent the first or upper bearing surface  54 , the insets  63 ,  64  should be sufficiently wide so that the block  50  can be inverted and be positioned on an identical block (in either of four half-overlap, on bond, relationships) to form a section of a vertical wall, i.e., a wall without set back, while having the locator (projection) arrangement of each one projecting in to a recess (inset) of the other. In addition, block  50  can be positioned in a section of a set back wall, with one block  50  positioned on a identical block  50  in a half-overlap, on bond, relationship, with the locator (projection) arrangement  58  of one engaging the inset at the second bearing surface  55  of the other, to define set back S. 
     It can be understood that blocks  50  can be used analogously to blocks  1 , alone, to form either a wall with set back or vertical wall with opposite exposed, faces. In a vertical wall, the opposite exposed faces would generally be decorative, providing the opposite faces  70 ,  71  of each block  50  is molded or otherwise made to be decorative. On the other hand, because they are configured with the same height and depth, blocks  50  can be used in cooperation with block  1  to form either a section of a wall with set back or a section of a vertical wall with no set back. 
     If the intent is to form a wall with set back, blocks  1  and  50  would be used together in an analogous manner to which they would used separately, i.e., preferably with each configured to form the same set back S 2 . Should a location occur where the locator projection arrangement  8 ,  58 , interferes with a vertically adjacent block, that locator projection arrangement  8 ,  58 , can be chiseled off in the field. 
     Also as indicated, the blocks  1 ,  50 , can be used together to form a vertical wall with no set back. An example of this is illustrated in connection with  FIG. 13 , where section  75  of a vertical wall is depicted comprising two blocks  1  and one block  50 , each two adjacent blocks being oriented in head-to-toe relationship with each next adjacent (to the side) one of the blocks  1 ,  50 . A course, above the course depicted in  FIG. 13  will be built analogously to the description above for  FIG. 10 . In the field, when the vertical wall is created, a person creating the wall can select from among other blocks  1 ,  50 , oriented as desired for desirable appearance throughout the wall, with any two vertically engaging blocks being configured with either: the first bearing surface ( 4 ,  54 ) of one engaging the first bearing surface ( 4 ,  54 ) of the other; or, a second bearing surface ( 5 ,  55 ) of one engaging the second bearing surface ( 5 ,  55 ) of the other. In such a wall section, typically the locator (projection) arrangements ( 8 ,  58 ) are oriented so that they can be received with an inset (recess) of the next vertically adjacent block  1 ,  50 , when positioned above, for example in a half-overlap, on bond, relationship. However, should a location occur in which interference between a locator (projection) arrangement on one block and the next vertically adjacent block occurs, that locator projection can be removed as described previously. 
     As will be understood from descriptions below, according to the present disclosure blocks  1 ,  50 , are each configured to also be usable in a set with still additional blocks, to provide for still more optional variation in the appearance of a resulting wall, whether set back or vertical. Such blocks are described next. 
     B. A Second, Alternate, Block,  FIGS. 14-16   
     To provide additional variation in sections of walls (set back or vertical) that can be made with blocks in accord with the principles described herein, it is sometimes desirable to provide blocks having variations in height from blocks  1  and  50 . Example of such blocks are depicted in  FIGS. 14-18  comprising block  80 ,  FIG. 14  and block  120 ,  FIG. 17 . In a particularly convenient system, the two additional blocks  80 ,  120  are configured so that a combined height of the two when stacked one on top of the other, is equal to the height H (0.5 H) of each of blocks  1 ,  50 . It is noted that in this context, the combined height refers to the height dimension between the bottom most bearing surface of the lower block, and the upper most bearing surface of the upper block, and any additional height provided by the locator projection arrangement is disregarded. In an example assembly depicted, each block  80 ,  120  is one-half the height H of blocks  1 ,  50 . Thus for the example depicted, the height H of block  80 ,  FIG. 14 , is 3 inches (76 mm). 
     Referring to  FIG. 14 , third block  80  is depicted in perspective view, and comprises a block body  80   b  having: a first, in the orientation depicted upper or top, bearing surface  84 ; and. a second, opposite, (in the depiction of  FIG. 14  lower or bottom) bearing surface  85 . The second (lower) bearing surface  85  is typically flat and unfeatured, although alternatives are possible. The first (upper) bearing surface  84  includes a central locator arrangement  88  (depicted as a locator projection arrangement)in the example shown surrounded by trough  88   t , but which is typically otherwise flat and unfeatured. The block  80  includes opposite block sides  90 ,  91 , each having an inset  93 ,  94  respectively therein, insets  93 ,  94 , in the example shown, extending completely between bearing surfaces  84 ,  85 . In the example block  1  depicted, locator (projection) arrangement  88  is a single projection  88   p.    
     The insets  93 ,  94  each include a most recessed wall  97 , and a pair of opposite inset sidewalls  98 ,  99 . 
     Block  80  includes a first, (in this instance decorative) exposure face  100  and a second, opposite, exposure face  101 , typically also decorative, see  FIG. 15 , a top plan view. Still referring to  FIG. 15 , it is noted that the opposite sidewalls  90 ,  91  in the example block  80  depicted, converge toward one another in extension between the opposite sides  100 ,  101 . Typically, each extends at an angle of convergence X, which is the same as the other; and, since it is to be used in a block set with blocks  1 ,  50 , angle X (being the angle of convergence of the sidewalls of each block  1 ,  50 ,  80 ) should be the same as the others. In the example depicted sidewalls  90 ,  91  are generally planar, as is typical. 
     In the example depicted, first face  100  is the longer or wider face, and the second, opposite, face  101  is the shorter or narrower face. The insets  93 ,  94 , are positioned and configured so that when block  80  is stacked on an identical block (or one of blocks  1 ,  50 ) in a half-overlap, on bond, orientation (head-to head) to form a section of set back wall, with the wider face  100  being the exposed face from which set back occurs, the amount of set back for block  80 , relative to a below block, is proportional to the set back for the blocks  1 ,  50 , in accord with the proportion of the height differences between block  80  and blocks  1 ,  50 . Thus, for example in the described set, in which the height H (0.5 H) of block  80 , is one-half the height H of blocks  1 ,  50 , then insets in block  80  would be positioned for one-half the set back, with respect to an underneath block. In the example described in which the set back S 2  defined by blocks  1 ,  50  is 0.42 inches (10.7 mm) the set back S 1  defined by block  80 , would be one-half of that (0.21 inches or 5.35 mm). 
     Example dimensions for the first face  100 , for a set of blocks being described herein, is for example 3 inches (76 mm) high (H)×16 inches (406 mm) long (L), with the dimension of the opposite face  101  being 3 inches (76 mm) high×14 inches (356 mm) long. A depth of the block between the surfaces  100 ,  101  would typically be chosen to be the same as the blocks  1 ,  50  if used in a set with blocks  1 ,  50 . Thus, for the example described, the distance T across the flat portion of bearing surface  84 , in a direction between surfaces  100 ,  101 , would be 9.5 inches (241 mm), with the decorative surfaces  100 ,  101 , each, adding about 0.75 inch (19 mm) to this, for a total of 11 inches (279 mm). Such a block can be configured from dry cast concrete. The block would typically have a unit weight of about 30 pounds (13.6 kg), and would be usable to provide a set back wall section having a wall unit batter of 4°, whether used alone or in combination with one or more blocks  1 ,  50 . 
     The insets  93 ,  94 , are typically configured generally analogously to the insets of blocks  1  and  50  and are typically configured as mirror images of one another. In  FIG. 16 , a side elevational view of block  80  is depicted, the view being generally taken toward side  90 . It is noted that the view toward  91  would typically have the same features, but reversed. Thus. for example, insets  93 ,  94 , where they intersect first bearing surface  84  have a wider dimension D 1  thereacross than the dimension D 2  across the insets  93 ,  94 , where they intersect second bearing surface  85 . The location of inset  93  and the dimension across the inset D 2  adjacent second bearing surface  85  are typically chosen to provide for appropriate positioning of the inset wall  98  closest the exposure surface or face  100  for the desired set back as discussed above. Also D 2  is typically chosen to provide for optional angling of blocks  80  relative to one another in set back courses, or in set back courses with blocks  1 ,  50 . Typically dimension D 2  will be chosen to be the same as dimension D 2  of blocks  1  and  50 . 
     On the other hand, where the insets  93 ,  94  intersect the first bearing surface  84 , the dimension D 1  thereacross is larger, and is typically chosen to be sufficiently large so that block  80  can be inverted and be set upon an identical block (or one of blocks  1  and  50 ), in half-overlap, on bond relationship, in adjacent courses to generate a vertical wall without set back, analogously. It is noted that for the particular example depicted, block  80  has generally the same perimeter definition, disregarding the inset location, at block  1 . However the insets  93 ,  94  of block  80  are moved slightly toward first face  100 , relative to block  1 , to generate half the amount set backs since the block  80  is one-half as high (H). 
     The reason that block  80  is configured to provide for half the offset as blocks  1 ,  50 , is that block  80  has one-half the dimension H (height). The object of course is to provide for the same total set back (i.e., wall unit batter) in any location across set back wall made with blocks  1 ,  50 ,  80 . 
     Referring to  FIG. 15 , insets  93 ,  94  each have a most recessed wall  97 , a first, front, inset sidewall  98  and an opposite, second, block, sidewall  99 . 
     As with blocks  1  and  50 , block  80  can be generally characterized as having recess arrangement and engagement surface arrangement, generally as characterized herein above. For the particular example block  80 , as with blocks  1 ,  50 , the recess arrangement and the engagement surface arrangement, together, are defined by the insets. 
     C. A Fourth Block Example,  FIGS. 17 ,  18   
     Attention is now directed to block  120 ,  FIGS. 17 ,  18 . Referring to  FIG. 17 , block  120  is depicted in perspective view. In general block  120  is to block  80 , as block  50  is to block  1 . Thus, block  80  will have half the (width) (i.e. the length of widest or longest face) as block  80 , while having the same height H (distance between bearing surfaces) and depth T (distance between decorative surfaces) as block  80 . 
     Referring to  FIG. 17 , block  120 , then, comprises a block body  120   b  having first and second, opposite, bearing surfaces  124 ,  125 . The first bearing surface  124 , in the orientation of  FIG. 17 , is an upper or top bearing surface, and includes thereon a locator arrangement  128 , in a particular locator projection arrangement which in the example depicted, in a single projection  128   p  surrounded by a trough  128   t . The locator  128  generally projects upwardly from a remainder  124   s  of bearing surface  124 , which is typically flat and unfeatured. 
     The second bearing surface  125  is typically flat and featureless, although alternatives are possible. 
     Block  120  includes opposite block sides  130 ,  131 . The block sides  130 ,  131  for the example depicted, are typically flat and featureless except for the positioning of insets  133 ,  134 , respectively therein, although alternatives are possible. 
     Insets  133 ,  134  are each generally defined by most a recessed wall  137  and opposite inset sidewalls  138 ,  139 . Insets  133 ,  134  are typically positioned as mirror images of one another and in the example depicted, each extends completely between bearing surfaces  124 ,  125 . In  FIG. 18 , a plan view of block  120  is provided, directed toward surface  124 . Where the insets  133 ,  134  intersect the bearing surface  124 , a distance between the walls  138 ,  139 , defined at D 1  is greater than an analogous distance D 2  where the inset intersect the bearing surface  125 . Selection of the dimensions D 1  and D 2  is generally based on the same principles as used for selecting analogous dimensions in blocks  1 ,  50  and  80 , as previously discussed. Generally the dimensions D 1  and D 2  can be the same as in the other blocks  1 ,  50 ,  80 . 
     Referring to  FIG. 18 , block  120  includes first and second, opposite, faces  140 ,  141 , respectively, which can each be configured as decorative faces, see  FIG. 18 . Thus, surface  140  is a first, exposure face. 
     Typically the block sidewalls  130 ,  131  converge toward one another, in extension to face  140  toward face  141 , the angle of convergence X of each typically being the same, as indicated at X. Preferably that angle of convergence X for the sidewalls  130 ,  131  is the same for block  120  as it is for blocks  1 ,  50  and  80  when the blocks are to be used as a set. 
     Example dimensions for face  140  are 3 inches (76 mm) high (H) by 8 inches (203 mm) long (L) and for face  141  is 3 inches (76 mm) high by 6 inches (152 mm) long. Thus, for the example block  140  depicted, a distance along bearing surface  124  (i.e., flat surface) between the faces  140 ,  141  is typically the same as blocks  1 ,  50 ,  80 , i.e., is about 9.5 inches (241 mm), with the sculpted faces  140 ,  141  each adding an additional 0.75 inch (19 mm) causing a total wall depth of about 11 inches (279 mm) maximum. The block would weigh about  14  pounds (6.4 kg). 
     The perimeter definition of locator projection arrangement  128  would typically be analogous to the perimeter of locator projection arrangement  58 ,  FIG. 12 , i.e., locator projection arrangement  128  would have a similar width (direction between faces  140 ,  141 ) as an analogous dimension of locators  8 ,  58  and  88 ; and, would have a length (extension in direction parallel to direction between insets  133 ,  134 ) which is smaller than for block  120  (typically about half) and would be the same as locator (projection)  58 , block  50 . 
     Since block  120  is configured to have height dimension H (between bearing surfaces  124 ,  125 ) which is the same as block  80 , but which is one-half of blocks  1  and  50 , it will generally be configured so that when used in a set in accord with the descriptions herein, block  120  provides an offset in association with (above) or any of blocks  1 ,  50  and  80 , which about one-half of set back defined by blocks  1  and  50  (and which is the same as block  80 ) i.e., for the example described 0.21 inches (5.35 mm). 
     When configured as described, block  120  can be used with other identical blocks to form a section set back wall, analogously to as previously described for the other blocks  1 ,  50 ,  80 ; and, it can be used to create a vertical wall section with identical blocks, again as previously described for blocks  1 ,  50 ,  80 . Further block  120  can be used in cooperation with block  80 , to analogously generate a section of a set back walls or section of a vertical wall. 
     Block  120  can be used in cooperation with a set of blocks comprising blocks  1 ,  50  and  80 , to generate wall sections (either set back or vertical) with variations therein to allow for variability in decorative design of a wall, as described in the next section. 
     As generally characterized above for blocks  1 ,  50 ,  80 , block  120  can be characterized as having a recess arrangement and an engagement surface arrangement as previously generally characterized. In the example block  120 , the recess arrangement and the engagement surface arrangement are generally formed by the two insets  133 ,  134 , although alternatives are possible. 
     IV. Example Wall Sections Using Blocks  1 ,  50 ,  80  and  120   
     As described previously, blocks  1 ,  50 ,  80  and  120 , as described herein, can be used to form either set back walls or vertical walls, which are decorative. In this section, examples are provided to facilitate an understanding of this. 
     Attention is first directed to  FIG. 19 .  FIG. 19  is a schematic example portion  150  of a wall section  151  generated with set back, and made using blocks  1 ,  50 ,  80  and  120 . In  FIG. 19 , wall section  150  is depicted with examples of the various blocks  1 ,  50 ,  80  and  120  so designated. 
     It can be seen that wall section  150  is configured to not have single horizontal joint extending completely thereacross. This is facilitated by configuring the wall in various sections as it is built vertically, with a mixture of blocks of first height (blocks  1 ,  50 ) and blocks of a second height (blocks  80 ,  120 ). 
     As each block is put in position, it is oriented with a set back relative to each lower block, with the second (lower) exposure face of each upper block engaging the first (upper) exposure face of each engaged lower block. The wall  151  defines an exposure face  152  in set back wall section  150 , formed by the first exposure faces ( 20 ,  70 ,  100  and  140  respectively) of each of the blocks  1 ,  50 ,  80  and  120 . 
     In wall section  150 , set back between each half-high block ( 80 ,  120 ) and any block below it will be established as a first set back dimension S 1 ; and, the set back between each full high block ( 1 ,  50 ) with respect to each block below it will be an established and defined set back distance S 2 ; for the example depicted with SI being one-half S 2  (S 1 =0.5×S 2 ). This will ensure that along the length of the wall section  150 , the same amount of total set back (or wall unit batter) will occur, without regard to the specific number of full high blocks ( 1 ,  50 ) and half high block ( 80 ,  120 ) used in the that particular portion of the wall section, as long as the same total height is reached. 
     Of course it will be understood that an analog construction can be used when an alternate set of blocks analogous to blocks  80 ,  20  (but which are not half-high blocks) are used. For example, if block  80  were two-thirds as high as blocks  1 ,  50 , it would be configured for two-thirds set back, and with  120  one-third as high as blocks  120  would be configured for one-third set back. The particular block kit depicted (blocks  1 ,  50 ,  80 ,  120 ) is particularly convenient however with blocks  80 ,  120  being half high (distance between bearing surfaces) and with blocks  50 ,  120  being half wide (longer dimension of wider face) relative to analogous faces in blocks  1 ,  80 ). 
       FIG. 20 , a small section  155  of wall  150  ( FIG. 19 ) is schematically depicted, which each of blocks  1 ,  50 ,  80 ,  120  used as shown. In  FIG. 21 , a top plan view of wall section  155  is provided. It can be seen that the taller blocks  1 ,  50  define twice the set back S 2  as the set back S 1  of shorter blocks ( 80 ,  120 ), with respect to underneath blocks. 
     In  FIG. 22 , a portion  175  of a vertical wall  176  is schematically depicted. Thus wall  176  has no set back. Further, when made with blocks  1 ,  50 ,  80  and  120  as identified, wall section  175  is provided with first and second decorative surfaces, the first decorative surface being indicated at  177  and a second decorative surface being at opposite surface  178 , not viewable in  FIG. 22 . 
     Wall section  175 ,  FIG. 22  is generally made with principles as described herein above. This will be understood further from a review of  FIGS. 22-24 . 
     In  FIG. 23 , a small section  180  of wall section  175  is depicted, formed from blocks  1 ,  50 ,  80  and  120 , as shown. In wall section  180  laterally adjacent blocks are rotated 180° with respect to one another, with respect to which of two exposure faces (wider or narrower) is directed toward the viewer; i.e., adjacent blocks are head-to-toe laterally. For convenience in  FIG. 23 , the particular faces exposed of blocks  1 ,  50 ,  80  and  120  are as identified. 
     Attention is now directed to  FIG. 24 , a top plan view of wall section  180 . Referring to  FIG. 24 , it can be seen that wall  176  will be a vertical wall (i.e., a wall without set back) having first and second, opposite, exposure faces  177 ,  178 . Assuming that the blocks  1 ,  50 ,  80  and  120  are used as described herein above, the faces  177 ,  178  will be decorative, as they will be formed from the decorative faces of the various blocks. It is noted that in  FIGS. 22-25 , wall  175  is drawn schematically, and detail showing these sculpted or decorative is not provided. 
     In  FIG. 24 , various blocks  1 ,  50 ,  80 ,  120  are identified appropriately. It can be sent that laterally adjacent blocks are oriented “head-to-toe” as previously described. It will also be understood that vertically adjacent blocks are depicted inverted relative to one another. 
       FIG. 25  a view analogous to  FIG. 24  is depicted, with hidden lines showing hidden, selected, features of the blocks. 
     Again, as described herein above, in a vertical wall or wall section made without set back, it is expected that a masonry glue would be positioned at joints between vertically adjacent blocks. 
     It is noted that with a precisely defined wall block set, any given wall design can be computer modeled and then be mimicked in the field. However, the blocks are configured for field assembly even without a preconceived or pre-designed block pattern. Thus, in the field, a variety of wall sections, without repeating block pattern sections readily discernible by the casual observer, can be conveniently made. It is noted that in some instances while laying the wall block, interference from locator arrangements (on one or both of the blocks) may occur. Should this occur, the interfering locator projection arrangement(s) can be chiseled off or otherwise removed as described herein above. In  FIG. 22 , phantom line locations  183  show where, for the particular wall section  175  depicted, the locator projection arrangement would typically have been removed. 
     It is noted that although the blocks  1 ,  50 ,  80  and  120  are particularly well configured to make curved sections in set back walls, but they are not as readily adapted for curved sections in vertical walls. However adjustments in angles of convergence of the block sides of various ones of the block can be made in the field, to cause a turning of a wall section, if desired. 
     V. Palleting (Cubing) of the Blocks 
     It is anticipated with the block set comprising blocks  1 ,  50 ,  80  and  120 , convenient palleting arrangements can be made for shipment to the field, to facilitate assembly. Typically a pallet would only include either tall blocks ( 1 ,  50 ) or short blocks ( 80 ,  120 ). Typically within the tall block set, the same number of wide blocks ( 1 ) and narrow blocks ( 50 ) would be provided. Typically in the short block set the same would be true i.e., there would be an equal of number of wide blocks ( 80 ) and narrow blocks ( 120 ). 
     Typically a pallet of tall blocks ( 1 ,  50 ) would be configured with the same total height of stacked blocks, as the pallet of short blocks ( 80 ,  120 ). Thus the tall block pallet would have half as many blocks as the short block pallet. 
     This configuration or cubing pattern of the blocks on pallets provides for convenient ordering of pallets for making a wall section. For example, if the wall section is to be a set back wall, it would be convenient to order twice as many tall block pallets as small block pallets, in order to obtain an equal number of tall blocks and small blocks in the wall. 
     For a typical free-standing wall it would be convenient to order an equal number of tall block pallets as small block pallets, since each pallet will have the same block face area (exposure face area) as the other. 
     VI. Corners and Columns 
     In some instances it will be desirable to introduce corners or columns into the walls. A wide variety of such corners or columns can be implemented with blocks according to the present disclosure, including through addition of other blocks to facilitate the construction. Some examples are described herein. 
     A. Example Corners,  FIGS. 33-36   
     Example corner constructions for a vertical or free-standing wall made with blocks according to the present disclosure are provided by  FIGS. 33-36 . In  FIG. 33 , an inside view of a corner  190  is depicted. In  FIG. 34  an outside view of the same corner  190  is shown. 
     In  FIG. 35  a top plan view of a course  191  in corner  190  is depicted. The corner  190 , in addition to being made using blocks analogous to block  1 , as characterized above, also uses a corner block  195  which is an added block, for example a block  195  which is 6 inches (152 mm) high by 16 inches (406 mm) long (and for example 9.5 inches (241 mm) deep) and has no insets or locator projection arrangement. It is noted that block  195  would be used as a corner block. Thus, when used in a decorative wall, it would typically have two, adjacent decorative faces  196 ,  197 . 
     It is noted that in course  191 , block  198  corresponds to modified version of block  1 , in particular with notch  199  has been cut out. It is also noted that block  200  corresponds to block  1  with edge  201  squared off with respect to surfaces  20 ,  21 ; i.e., block  200  is a field modified block  1 . 
     In  FIG. 36 , at  205  a second course  192  in corner  190  is depicted. Example usable blocks are identified. It is noted that block  206  has been modified from block  1 , by cutting notch  207  therein. Also block  210  has been field modified at side  211  to have side  211  extend generally perpendicularly to surfaces  20 ,  21 . These can be made as field modifications. 
     Using courses  191 ,  192  alternating with one another, corner  190 ,  FIGS. 33 and 34  can be constructed. It is noted that blocks in each course would be inverted relative to adjacent courses, as previously described, using a masonry glue between layers. 
     It is noted that the types of cuts described can be made in field, with block cutters. 
     B. Example Columns;  FIGS. 26-32   
     It is noted that a variety of columns can be configured by use of blocks in accord with the present description, in association with other blocks and modified blocks. These can include field modifications to previous blocks as desired or needed. Columns are sometimes desirable for example in free-standing walls either at ends, corners, or as selected in spaced locations. 
     In this section, example columns are depicted and described. 
     1. A First Example Column,  FIGS. 26-28   
       FIG. 26  provides a schematic example of a first column  215 . The column  215  can be made by alternating courses, as depicted in  FIGS. 27 and 28 . In general it is desirable that the column  215  be constructed with exposed wall faces comprising decorative faces. 
     Referring to  FIG. 27 , a first course  219  is depicted. Course  219  comprises, in part, blocks  50  oriented as shown, and corner blocks. It is noted that in  FIG. 27 , the course depicted includes a corner blocks  220 ,  221  which are field cut ones of blocks  155 ,  FIGS. 35 and 36 . 
     In  FIG. 27  block  225  (comprising a block  1 ) shows where an adjoining wall engages the column  215 . 
     In  FIG. 28 , a second course usable with the course of  FIG. 27 , to form the column in  FIG. 26 , is depicted. The blocks, depicted schematically, can be used as identified. With this configuration, the blocks do not necessarily have to be used inverted, in adjacent courses. However, in some locations it may either desirable to do so. It will typically be necessary to remove the locator projection arrangements in each course. 
     2. Second Example Column,  FIGS. 29-30   
       FIGS. 29 and 30  depict courses that can be used, alternately, to create yet another column configuration. Referring to  FIG. 29 , first, course  232  is depicted. It can be comprised of block  1 , corner blocks  195 , and cut block  220  as previously described, and intermittent blocks  234 , each of which comprises half of a block  50 , made by a field cutting blocks  50  in half. 
     A second course depicted in  FIG. 31 , is shown at  240 , made with similar blocks. 
     It is noted that the courses  232 ,  240  can be stacked alternating, to create a column. It is observed that it will typically be desirable to remove locator projection arrangements, to avoid interference. Also, in  FIG. 30 , side block  241  is depicted, comprising a block  1  modified at its side  242 , to extend perpendicularly between surfaces  20 ,  21  This is to facilitate abutting of a wall section against the resulting column in this course. 
     3. Third Example Column,  FIGS. 31-32   
     A third column can be made, for example, from courses  260 ,  261  depicted in  FIGS. 31-32 , alternating. The courses would comprise corner blocks  195  oriented as shown. 
     From the above examples of  FIGS. 26-32 , it will be understood that a variety of columns can be configured for use with free-standing walls (vertical walls) configured in accord with use of blocks as described herein. Of course a variety of alternate column arrangements can be configured. 
     VII. General Observations and Conclusions 
     According to a first aspect of the present disclosure, wall blocks are described with features appropriate for the wall blocks to be selectively used in a set back wall; and, for the same wall blocks to be selectively used in a vertical wall without set back. Herein the term “set back wall” is meant to refer to a wall having a section comprising wall blocks oriented with each block that is positioned above another block, to be in a position with a set back in a first direction, all set backs in the referenced wall section being in the same direction. Set back walls are configured, for example, to be used as retaining walls in landscaping. The set back for any given block in accord with characterizations of the present disclosure, can be at a selected value, S, and typically will be at a selected value S within the range 0.1 inch (2.5 mm) to 0.75 inch (19 mm), although alternate set backs are possible. A typical set back, as described herein, is configured to provide a wall batter (angle along the setback wall section from lowest portion to highest portion) of about 4°. A typical set back will be within the range of 0.15 inch (3.8 mm) to 0.5 inch (12.7 mm) inclusive. 
     The term “vertical wall” as described herein, is meant to describe a wall having a wall section in which wall blocks are positioned vertically above one another, to rise vertically without set back. A typical vertical wall is configured to be usable, for example, as a free-standing wall; i.e., a wall with opposite, exposed, faces or sides. 
     Herein when it said that a wall block is configured to be usable in each of the two types of walls, it is meant that the same wall block can be positioned in a wall with set back, or vertical wall, with the wall block having appropriate features for proper positioning therein. 
     Wall block configurations are described having features appropriate for the two uses described. The general configurations and features described, are usable in concrete wall block, whether made by wet cast or dry cast techniques. The specific features depicted in the drawings are particularly convenient for manufacture using dry cast concrete techniques. 
     With respect to use in a set back wall, specific block configurations are presented herewith, usable to form “mortarless” walls. Herein the term “mortarless wall” and variants thereof, is meant to refer to a wall that is constructed without mortar in horizontal joints or vertical joints, between blocks. Blocks usable in “mortarless walls” are sometimes referenced as “mortarless wall blocks.” 
     Herein, when it said that the blocks are usable in a vertical wall, it is generally meant that the blocks can be positioned in such a wall, due to features thereof. Typically a masonry glue or bond will be used between vertically adjacent blocks in a vertical wall. It is noted that such walls will typically be prepared, however, without a visible mortar in either vertical or horizontal joints. 
     Features described herein for wall blocks can be used to provide for a set back wall or wall section with a decorative exposed face. Herein the term “exposed face,” when used in connection with a set back wall, or setback wall section, is meant to refer to the face viewable to the observer of the wall, i.e., the exposed face (and not the face directed into the earth). Herein the term “decorative,” in this context, is meant to refer to a face which has decorative features thereon, and is not simply plain, flat, concrete. In examples described herein, in order to provide a set back wall with a decorative exposure face, each wall block is provided with a first exposure face that is made decorative by being molded with various contouring to provide concave and convex portions therein. This contouring can comprise, for example, a design mimicking the appearance of natural stone, or a design depicting the appearance of natural stone pieces, for example laid together or mortared together. 
     It is noted that specific example wall blocks described herein, are usable to form free-standing vertical walls having opposite, exposure, faces each of which is decorative. To provide for this effect, specific example wall blocks are described which have first and second, opposite, faces, each of which is decorative. 
     It is noted that herein example wall blocks are depicted which have a decorative front exposure face having a depth of thickness which is generally greater than a setback generated by the use of that block above another block. This can help create an attractive contour face in a setback wall section constructed with the block. 
     Herein, in general terms, a wall block is described comprising a block body having first and second, opposite, bearing surfaces; first and second, opposite, blocks sides; a first, exposure, face and a second face opposite the first exposure face. In general, the bearing surfaces of a block, are those surfaces directed either upwardly or downwardly, when the block is positioned in a wall. Typically, the opposite bearing surfaces comprise surfaces which: bear downwardly upon other surfaces; or, on which load is positioned to bear downwardly, when the block is positioned in a wall or wall section. Typically the opposite bearing surfaces of wall block are configured to extend generally parallel to one another, and typically generally horizontally, when positioned in a wall or wall section. 
     The first and second, opposite, block sides, typically comprise block sides that extend perpendicularly to and between the bearing surfaces. Further, the block sides are generally those surfaces that extend between opposite front and rear faces of a wall, when a wall block is positioned in the wall. 
     For a given wall block, the first exposure face is generally a face of the block which extends: vertically between the bearing surfaces; laterally between the opposite block sides; and, which surface is configured to be exposed for view, whether the wall block used in either a vertical wall section or in a set back wall section. A second face, opposite the first exposure face, typically extends: parallel to the first exposure face; laterally between the first and second opposite block sides; and, typically vertically between the first and second opposite bearing surfaces. The second face can comprise an exposure face, when the block is used in a section of a vertical, free-standing, wall. However, the second face may not be an exposure face, for example when the block is used in a section of a set back wall, and the second face is directed toward earth retained by the wall. 
     Wall blocks as generally characterized herein comprise a block body having a locator projection arrangement on the first bearing surface. The locator projection arrangement typically comprises a projection arrangement positioned on the first bearing surface and directed upwardly. The locator projection arrangement can comprise one or more projections. Specific examples are depicted, in which the locator projection arrangement on each block comprises a single projection extending generally vertically, for example an amount within the range of 0.2 to 0.4 inches (5.1-10.2 mm), inclusive. Example projection arrangements depicted herein, are configured with slanted sides that taper inwardly, as the projection extends upwardly for example at an angle of 60-80°, for example 70°, inclusive, to the horizontal. Also example projection arrangements are described herein, which include a trough arrangement surrounding (and adjacent) the locator projection arrangement. The trough arrangement, which typically within the range of 0.2-0.1 inch (0.5-2.5 mm), inclusive is configured to facilitate removing the locator projection arrangement, if desired, from the block in the field. Typical field removal of a locator projection arrangement would comprise chiseling the locator projection arrangement off by positioning a chisel within the trough arrangement. This will facilitate removal of the locator projection arrangement so that any remaining artifact is beneath a remainder of the bearing surface, to advantage. 
     It is noted that the trough arrangements surrounding the locator projection arrangement can result in additional advantage. For example, during a block molding operation, in which a pressure plate is directed downwardly to form the first bearing surface and locator projection arrangement, when that pressure plate is configured to form both the locator projection arrangement and the trough arrangement, it has been observed that the locator projection arrangement forms more desirably, than when the trough is absent. Also, the trough arrangement surrounding the locator projection arrangement, provides for a desirable, crisp, surface portion operating a stop, when the locator projection arrangement is engaged by another block, to create setback. 
     It is noted that the advantageous combination of a locator projection arrangement and trough arrangement can be used with alternate block and those usable in both setback walls and vertical walls, to advantage. 
     It is noted that example wall blocks as described herein, also have a block body which includes a recess arrangement in the first bearing surface. A recess arrangement generally comprises one or more recesses in the bearing surface configured to receive, projecting therein, a locator projection arrangement on a vertically adjacent block, in certain situations, described below. 
     Also, in accord with general descriptions herein, each wall block includes an engagement surface arrangement. The engagement surface arrangement is generally configured for engagement with the locator projection arrangement of another block, to define a selected set back(s), when the wall block is used in a set back wall. The engagement surface arrangement, for example, can comprise the wall of a recess positioned in the second bearing surface. 
     In general terms, the locator projection arrangement, engagement surface arrangement and recess arrangement are selectively configured so that: when the wall block is oriented in either one of two head-to-head, half-overlap, on bond, set back relationships, engagements or orientations with a second, identical, block in a section of a mortarless set back wall, the locator projection arrangement of a first, lower, one of the wall blocks, when directed upwardly is engaged by the engagement surface arrangement of second, upper, one of the blocks, when that second wall block is also oriented with the locator projection arrangement directed upwardly, to define a selected set back S. 
     With respect to this, the term “head-to-head” when used herein, is meant to refer to an orientation: in which the first exposure face of each of the two blocks is directed in generally the same direction; and, in which each of the second face opposite the first exposure face, of each block, is directed in the same direction, i.e., a direction generally opposite the first face. 
     Herein when it said that the blocks are positioned in a “half-overlap, on bond” orientation, it is meant that when two blocks are positioned vertically adjacent one another in a set back, the upper block is generally positioned in partial overlap (i.e., half-overlap) laterally offset from the lower block, as is typical for use of a wall block in a section of a set back wall. The two possible set back relationships would be a first one in which the upper block is laterally shifted from the lower block either one-half block width to the left or one-half block width to the right; the second half-overlap position having the compliment. 
     When the term “set back” or variants thereof is used herein, it is meant that if a upper block is positioned shifted rearwardly from the lower block, a fixed distance or set back S is defined by engagement between the locator projection arrangement of the lower block and the engagement surface arrangement of the upper block. It is noted that when it is said that a wall block has features that provide for such a relationship when the wall block is oriented in engagement with an identical block, in a portion of set back wall, or by similar terms, it is not meant that when actually positioned in a wall, the block is necessarily in engagement with an identical block. All that is meant is that the block has features so that it can be adjacent an identical block, in a section of such a set back wall. 
     Herein when the term “identical” is used in reference to a block engaging with a similar block, the term “identical” is meant to refer to general features of shape, and not that one block cannot be discerned from the other block, by the human eye, upon examination of specific grain features and/or surface imperfections or variations. In addition, the decorative faces of each can be varied from one another. 
     It is also noted that within the block, the locator projection arrangement, engagement surface arrangement and recess arrangement are typically configured so that when the wall block is oriented in any one of four half-overlap, on bond, vertical relationships with a second, identical, inverted wall block in a section of a vertical wall without set back, with the first bearing surface of each directed toward the first bearing surface of the other, the locator projection arrangement of each one projects into the recess arrangement on the first bearing surface of the other; the four vertical relationships identified comprising: two head-to-head, half-overlap, on bond, relationships; and, two head-to-toe, half-overlap, on bond relationships. 
     Herein, in this context, the term “head-to-head” is meant to have the same meaning as characterized above for a set back wall, i.e., the blocks are oriented: with the first exposure face of each generally directed in the same direction; and, with the second face of each generally directed in the same direction, and opposite the first exposure faces. The two, half-overlap, on bond, relationships, are generally as characterized above, expect without set back. Thus, an upper block is positioned above and laterally offset the lower block, by about one-half block width, in one of two possible lateral directions. 
     The term “head-to-tail” in the context of this characterization, is meant to refer to two adjacent blocks oriented with the first exposure face of the one directed oppositely of the first exposure face of the other; and, with the second exposure face of the one directed oppositely of the second exposure face of the other. 
     It is noted that the characterization of the locator projection arrangement of each one projecting into the recess arrangement on the bearing surface of the other, means that the recess arrangement is configured to not interfere with the locator projection arrangement, when the blocks are oriented as described. More is not meant. Thus, it is not meant that the locator projection of one is completely received within the recess of the other; rather it is merely meant that the recess arrangement is configured to provide clearance as necessary, for the possible described engagement. 
     It is also noted that when a first wall block is described as having features such that it can be positioned with respect to an identical block in a portion of a vertical wall, it is not necessarily meant that when an actual vertical wall section is made, two identical blocks are so positioned. Rather, when the blocks include features so that they can be positioned as described, the blocks are advantageously featured for use in a vertical wall section without set back. 
     It is noted that the engagement surface arrangement and the recess arrangement together, can be defined by an inset arrangement; the inset arrangement typically comprising a first inset in the first sidewall and a second inset in the second sidewall; each of the first and second insets extending completely between the first and second, opposite, bearing surfaces. Examples of this are depicted. 
     Although alternatives are possible, the first and second insets, for the examples depicted, are configured and oriented as mirror images of one another. This is particularly convenient, for variability of the wall blocks in use. 
     In general, when the wall block body includes insets as characterized above, each inset has first and second, opposite, inset sidewalls, and for each inset a distance D 1  between the first and second, opposite, inset sidewalls adjacent the first bearing surface is larger than a distance D 2  between the first and second, opposite, inset sidewalls adjacent the second bearing surface. Typically, the insets are configured so that D 1  is at least 1.7×D 2 , and often D 1  is about 1.9-2.2×D 2 , inclusive. 
     Although a wall block can be configured so that the first and second opposite sides (sidewalls) are planar and extend generally parallel to one another in extension from the first face toward the second face, typically the first and second opposite block sidewalls are made planar and are oriented to converge toward in extension from the first face toward the second face. Advantages relating from this convergence the two sidewalls toward one another, concern: blocks being advantageously usable in a set back wall even in sections of curvature (for example convex or concave wall sections); and, positioning the wall blocks adjacent to one another, head-to-toe, in a vertical wall section. 
     Although alternatives are possible, for a typical wall block the first sidewall extends at an angle of convergence X which is the same as an angle of convergence X of the second sidewall; the angle of convergence X being an angle of general direction of the sidewall relative to a plane extending perpendicularly between the first and second faces. Although alternatives are possible, in typical applications, the angle of convergence X is a selected angle within the 3° to 12°, inclusive, for example 7.8°. 
     In general terms, the first exposure face can be characterized as having a height H and length L. The first bearing surface can be characterized as extending in a direction between the first and second exposure faces a distance T. The distance T when characterized herein, is generally meant to exclude any dimension in the block provided in the same direction, by the decorative first and second faces, when made with contouring. Thus, the dimension T is meant to be the dimension across a bearing surface, but not including decorative portions of the first and second faces when present. In an example block described herein, the height H is 6 inches (15.24 mm), the length L is 16 inches (406 mm); and, distance T is 9.5 inches (241 mm). Alternate blocks are described in which the height H is 3 inches (76.2 mm). Also alternates are described in which the length L is 8 inches (203 mm). Some blocks are described in which the height H is 3 inches (76.2 mm) and the length L is 8 inches (203 mm). 
     In a typical wall block set according to the present disclosure, each of the wall blocks has the same dimension T, even though variations with respect to height H and length L are used. 
     Herein, sets of wall blocks usable selectively to form a section of a set back wall and also usable selectively to form a section of a vertical wall are described. Such a set would typically comprise at least two wall blocks each of which is generally as configured above, but which differ from one another, at least with respect to one of the height H and the length L of the first exposure surface. 
     In one example set, a plurality of first wall blocks and a plurality of second wall blocks are included, the difference between the wall blocks generally relating to the dimension L of the first exposure face, the dimension L of one being one-half the dimension L of the other. 
     Also described herein is a set of wall blocks as described comprising first and second wall blocks as generally characterized herein, which differ from one another in height H of the first exposure face. 
     Also described herein are sets of wall blocks which include multiple wall blocks generally as characterized above, differing from one another with respect to at least one of: height H of the first exposure face; the length L of the first exposure face; and/or the amount of set back S as defined by that block, when positioned above and in set back relationship with at least one other block in the set. Some example configurations for such wall block sets are described. 
     It is also noted that herein wall sections are described, comprising the various blocks as characterized. Some methods of forming such wall sections are described. 
     It is noted that when blocks as described herein are characterized as positioned in a section of a vertical wall, they may be sometimes characterized as being in a first bearing surface-to-bearing surface engagement; or, in a second bearing surface-to-second bearing surface orientation or engagement. The term first bearing surface-to-first bearing surface engagement (relationship or orientation) in this context is meant that the vertically adjacent blocks are positioned when the first bearing surface of one is engaged by the first bearing surface of the other. When the term “second bearing surface-to-second bearing surface engagement” (relationship or orientation) is used, it is meant that the second bearing surface of one of two vertically adjacent is engaged by the second bearing surface of the other. 
     Also described herein are techniques for forming corners and columns, for use in association with wall sections made with blocks according to the present description. 
     Also described herein, are wall blocks provided with a first bearing surface having a locator projection arrangement thereon, surrounded by a trough. The wall block may include selected ones of the additional features characterized herein, if desired. The trough is typically configured to have a depth as described above. The trough can be configured to a circular radius, and thus be semi-circular cross-sectional configuration. 
     It is noted that there is no specific requirement that any given wall block, or wall section, comprise all of the features characterized herein, made with all of the techniques characterized herein, in order to obtain some benefit according to the present disclosure. From the descriptions it will be apparent that variability is optional, while accomplishing the objectives described. Further, there is no specific requirement that when actually used in a wall section, a block cannot be modified from the description contained herein, for example with respect to: removal of a locator projection arrangement; or, a field cut or notch provided the block to be appropriate to define a specific feature in a wall.