Patent Publication Number: US-RE49534-E

Title: Border, edge or pattern carpet tile design, manufacture and installation

Description:
CROSS REFERENCE TO RELATED APPLICATION APPLICATIONS 
     More than one reissue application has been filed. This application is a continuation reissue application of U.S. Ser. No. 15/731,311, filed May 22, 2017, now allowed, which is a reissue application of U.S. Pat. No. 9,211,024, which claims priority to U.S. Provisional Patent Application Ser. No. 61/688,242 filed May 10, 2012 and entitled Border, Edge or Pattern Carpet Tile Design, Manufacture and Installation, all of which isare incorporated herein in itstheir entirety by this reference. 
    
    
     FIELD OF THE INVENTION 
     This invention relates generally to carpet tiles and their installation and to methods of designing and manufacturing carpet tiles usable to create installations of carpet tiles with borders, edges or other multi-tile designs, including such carpet tiles that can be assembled on a floor with tiles in any appropriate location and facing in multiple directions, without any of the tiles appearing to be out of place in position or rotational orientation. 
     BACKGROUND OF THE INVENTION 
     Discernible patterns on a floor are sometimes desired for both aesthetic and functional reasons. As examples of functional reasons, discernible floor patterns can define walking paths to direct people to particular parts of a room or building, including to emergency exits. Relatively large squares, rectangles, circles and other shapes smaller than an entire room can establish intended locations on the floor of tables, chairs or other furniture or equipment or a gathering place, such as a reading group location on a classroom floor. 
     Large discernible patterns on a floor are also aesthetically desirable and can provide desired visual impressions, such as (a) greater or small size or room division, (b) visual organization from regimented pattern elements or (c) visual disorganization from design elements placed without discernible organization. Hospitality flooring installations often include borders and bold designs, resulting in demand for such discernible patterns in this segment of the flooring market. 
     U.S. Pat. No. 8,141,505 to Hall et al. (“Hall”), the entirety of which is incorporated herein by reference, describes a tufting machine and related system for controlling the machine to form “free-flowing patterns.” Hall discloses a needle bar with a plurality of needles arranged across the bar. A yarn is associated with each needle. A backing material is fed under the needle bar, which is reciprocated to drive the needles through and out of the backing material to form loops of yarn in the backing material. 
     If the needle bar did not move laterally relative to the backing and operated as described above, the resulting product would simply consist of yarn loops extending in lines of a single color along the length of the backing material. To form a pattern with the yarn loops, it is necessary for the needle bar to shift laterally to vary the positioning of the different color yarn loops on the backing material to form a design. Hall teaches a control system that is programmed with the desired pattern information and that controls operation of the machine, including shifting of the needle bar, to create a desired pattern in the final tufted product. 
     Hall teaches thread-up of the needle bar with a repeating pattern of yarn colors across the needle bar. Thus, if the desired product is to have three different yarn colors (A, B, and C), those three colors would be threaded-up in the same order or sequence across the entire needle bar (i.e., ABCABCABC, etc.). Hall teaches this same thread-up methodology of a repeating sequence or pattern of the colors regardless of the number of different color yarns desired to be used. The control system must be told how many different color yarns are being used so that it can adjust the shifting of the needle bar and speed of tufting accordingly, as discussed below. 
     The appearance of a yarn loop on the face of a tufted product can be controlled by controlling the height of that yarn loop. Where a yarn loop of a particular color, texture or other characteristic is not to be readily visible at a particular location, that yarn loop is formed or tufted “low” in that location so that the surrounding tufted loops of a different color or other characteristic that are to be visible are higher and thus more clearly visible. 
     Hall controls the visibility of yarn loops on a tufted product by controlling the tension placed on the yarn to either “pull low or backrob” a yarn loop. According to applicants&#39; understanding, to “pull low” the yarn loop is first tufted to a tuft height and then partially pulled back through the backing material so as to form a lower height yarn loop extending from the backing material. To “backrob,” the yarn loop is first tufted and then pulled entirely from the face of the backing material. Some such loops are pulled entirely free of the backing, but others are left sufficiently embedded in the backing to “tack” the yarn in place on the backside of the backing. In this way, the backrobbed yarn loops are not visible at all on the face side of the backing material. 
     The implementation of pulling low or backrobbing results in a tufted product having a smaller amount of visible yarn on its face. To compensate for this, Hall teaches that the density of the yarn loops provided within a given length of the backing material must be increased. To achieve this, the machine must be operated at an increased or denser “stitch rate” (which Hall defines as the number of stitches per inch). Operation of the machine at a denser stitch rate slows the speed at which tufted fabric can be produced. For a given tufting bar reciprocation rate, the denser the stitch rate required, the slower the backing material can be fed through and tufted by the machine, and thus the slower the machine can be run. 
     SUMMARY OF THE INVENTION 
     The terms “invention,” “the invention,” “this invention” and “the present invention” used in this patent are intended to refer broadly to all of the subject matter of this patent and the patent claims below. Statements containing these terms should be understood not to limit the subject matter described herein or to limit the meaning or scope of the patent claims below. Embodiments of the invention covered by this patent are defined by the claims below, not this summary. This summary is a high-level overview of various aspects of the invention and introduces some of the concepts that are further described in the Detailed Description section below. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used in isolation to determine the scope of the claimed subject matter. The subject matter should be understood by reference to appropriate portions of the entire specification of this patent, any or all drawings and each claim. 
     Carpet tiles or modules are typically square or rectangular and are installed abutting each other to provide a carpeted room or portion of a room, corridor or other floor space. Carpet tiles are typically manufactured by manufacturing a carpet tile “web,” often about six feet or two meters wide. Although other techniques are also used, carpet tile webs are usually “tufted.” In tufted carpet tile, loops or “tufts” of carpet yarn are inserted in a suitable sheet of backing material as the backing is advanced through a tufting machine. Secondary backing materials are then applied to the underside of the tufted carpet tile web, and the backed web is then cut into carpet tiles of suitable size and shape. Many such tiles are either eighteen inches or one-half meter square. 
     This invention provides carpet tiles and methods of making carpet tiles that generally obviate the need to orient the tiles (with respect to nap) relative to each other, permitting the tiles to be installed randomly or in any chosen pattern without any tiles looking out of place relative to nap. Some or all of the tiles may also carry relatively bold or prominent visual elements that can be positioned in locations on a floor that create a wide variety of highly discernible visual patterns, particularly including borders, edges and other pattern elements that may span (or be produced by) more than one tile. Other of the tiles may carry relatively less prominent visual elements that may form a “field” area in an installation using tiles having (a) bold visual elements together with (b) tiles having relatively less prominent visual elements, and, in some instances with (c) tiles having both bold (and prominent) and less bold (and less prominent) visual elements. 
     Furthermore, tiles manufactured in accordance with aspects of this invention can include tiles faces or portions of faces that feel different under foot or sound different when walking. Through the use of such tiles, tile assemblies can be installed that have borders, edges and other pattern elements discernible in ways other than visually or in ways in addition to visually. 
     All of the different carpet tiles to be used in a particular tile assembly in accordance with some embodiments of this invention can be manufactured from the same tufted web using the same carpet yarns. 
     The Hall tufting machine provides capabilities previously unavailable, including the ability to produce carpet face yarn patterns with any of a number of yarn colors positioned in any desired location on the tufted web and with any desired tuft height from zero (no tuft present on the carpet face) to a desired maximum tuft height, which can be substantial. 
     Tiles of this invention may be manufactured using tufting machines with the apparatus described in the Hall patent. The Hall apparatus (and some other tufting machines) can tuft carpet face cloth with crisp “edges” (or clear or abrupt transitions) between face elements of one yarn color, height, texture or other characteristic and adjacent elements of another yarn color, height, texture or other characteristic. Tufted face cloth with crisp “edges” between face elements of one yarn color, height, texture or other characteristic and adjacent elements of another yarn color, height, texture or other characteristic manufactured without using the Hall apparatus may exhibit “direction” or “nap” so that adjacent tiles not facing the same direction may look out of place relative to each other. 
     When operated according to at least portions of the methods of this invention, the Hall apparatus can also tuft carpet yarn such that the transition from a first yarn color, height, texture or other characteristic to a second yarn color, height, texture or other characteristic is “fuzzy,” gradual or indistinct, meaning that across the carpet face an area has only the first yarn color, height, texture or other characteristic visible and transitions through a mixture of predominantly the first yarn color, height, texture or other characteristic to an equally balanced mixture of the first and second yarn colors, heights, textures or other characteristics to a mixture of predominantly the second yarn color, height, texture or other characteristic and ultimately to an area having only the second yarn color, height, texture or other characteristic visible. More complex transitions are also possible using three, four or more yarns that differ in color, height, texture or other characteristic. 
     When operated according to at least portions of the methods of this invention, the Hall apparatus can also tuft carpet yarn so that at least some carpet modules have a discernible edge that varies significantly in shape and extension and that provides a transition regions of greater width and flexibility. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee. 
       Illustrative embodiments of the present invention are described in detail below with reference to the following drawing figures: 
         FIGS.  1 ,  2  and  3    are top or plan views of individual carpet tiles of this invention. 
         FIG.  4    is a perspective rendering of a room with a carpet tile installation in accordance with this invention. 
         FIG.  5    is another perspective rendering of a room with another carpet tile installation in accordance with this invention. 
         FIGS.  6 - 11    are top or plan views of assemblies of carpet tiles of this invention. 
         FIG.  12    is a schematic elevation view of tufted fabric having a “crisp” color transition. 
         FIG.  13    is a schematic elevation view of tufted fabric having a gradual or “fuzzy” color transition. 
         FIG.  14    is a schematic elevation view of tufted fabric having a “crisp” pile height transition. 
         FIG.  15    is a schematic elevation view of tufted fabric having a “crisp” yarn texture transition. 
         FIG.  16    is a simulated layout image of an assembly of this invention with visually complex images forming a border around an area of visually less complex images. 
         FIG.  17    is a simulated layout image of an assembly of this invention with a central area of visually less complex images surrounded by a wide boarder of visually more complex images that is itself surrounded by a narrow border area of visually less complex images. 
         FIG.  18    is a simulated layout image of an assembly of this invention with a central area of visually more complex images surrounded by a boarder of visually less complex images that is itself surrounded by a narrow border area of visually more complex images. 
         FIG.  19    is a simulated layout image of a cruciform assembly of this invent. 
         FIG.  20    is a simulated layout image of a banquet room with an assembly of this invention with visually complex images forming a border around an area of visually less complex images. 
         FIG.  21    is a simulated layout image of a banquet room with an assembly of this invention with visually less images forming a border around an area of visually more complex images. 
         FIG.  22    is a simulated layout image of a hallway with an assembly of this invention with visually complex images forming a border along the hallway walls beside a central area of visually less complex images. 
         FIG.  23    is a simulated layout image of a hallway with an assembly of this invention with visually less complex images forming a border along the hallway walls beside a central area of visually more complex images. 
         FIG.  24    is a simulated layout image of a hallway with an assembly of this invention with visually complex images in a longitudinally central portion of the hallway and with the remainder of the hallway floor covered with visually less complex images. 
         FIG.  25    is a simulated layout image of a hallway with an assembly of this invention with, along a first portion of the hallway, visually complex images on one side of the hallway and visually less complex images on the other side and, along a second portion of the hallway, reversed visually complex and visually less complex images. 
         FIG.  26    is a simulated layout image of a hallway with an assembly of this invention with visually complex images filling the hallway floor except for a diagonal region of visually less complex images. 
         FIG.  27    is a simulated layout image of a hallway with an assembly of this invention with alternating regions of visually complex images and less complex images and with visually less complex images at the doorways. 
         FIGS.  28 - 31    are simulated layout images of assemblies of additional embodiments of this invention. 
         FIG.  32    is a first web design or pattern used in producing first tiles used in the assemblies depicted in  FIGS.  28 - 31   . 
         FIG.  33    is a second web design or pattern used in producing second tiles used in the assemblies depicted in  FIGS.  28 - 31   . 
         FIG.  34    is a third web design or pattern used in producing third tiles used in the assemblies depicted in  FIGS.  28 - 31   . 
     
    
    
     DETAILED DESCRIPTION 
     The subject matter of embodiments of the present invention is described here with specificity to meet statutory requirements, but this description is not necessarily intended to limit the scope of the claims. The claimed subject matter may be embodied in other ways, may include different elements or steps, and may be used in conjunction with other existing or future technologies. This description should not be interpreted as implying any particular order or arrangement among or between various steps or elements except when the order of individual steps or arrangement of elements is explicitly described. 
       FIGS.  1 ,  2  and  3    depict individual carpet tiles of embodiments of this invention that have a “moss on rock,” “fuzzy” or gradual edge transition appearance. 
       FIG.  6 - 11    depict assemblies of carpet tiles of this invention, some of which having visible shapes exhibiting “crisp” and/or “fuzzy” edges. 
       FIG.  6    has been marked with lines  10  identifying the individual, square tiles. Tile  12  displays a first uniform color or pattern  13 , tile  16  displays a second, different uniform color or pattern  15 , and tiles  14  display the first  13  and second  15  uniform colors or patterns and have a “fuzzy” edge  18  between the two  13  and  15 . Tiles  14  have a “crisp” edge within color or pattern  15  at tile edge  17 . 
       FIGS.  7 - 11    illustrate different assemblies of only tiles  14 , each of which tile  14  has a “fuzzy” edge or boundary  18 . That a substantial number of borders or other patterns can be produced as illustrated in  FIGS.  7 - 11    with only one pattern of tile  14  vividly demonstrates the versatility of tiles manufactured in accordance with this invention and the endless number of possible embodiments of this invention. 
     “Crisp” edges or clear (abrupt) transitions in appearance may be produced by inserting yarn of a first color to produce relatively equally projecting yarns of that color on one side of a “boundary line”  19  and inserting yarn of a second color to produce relatively equally projecting yarns of that second color on the other side of the “boundary line”  19 , as shown in  FIG.  12   . This will produce a clear, crisp transition from one color to another. 
     Such clear transitions can likewise be produced by abruptly changing other visible yarn or pile characteristics, including pile height, yarn texture, yarn type or any other discernible differences in yarn or pile such as transition between loop pile and cut pile. 
       FIG.  12    is a schematic elevation view of a tufted fabric  20  comprising a primary backing  22  and yarns of a first color  24  and of a second color  26 . Substantially equal-height yarns  24  are side by side and, moving left to right along the drawing, are abruptly replaced at boundary line  19  by substantially equal-height yarns  26  of a second color. If the yarns behind those depicted in  FIG.  12    are the same height and color of those schematically depicted in  FIG.  12   , then the fabric  20 , when seen from above, will exhibit a very clear, “crisp” color transition. 
     By contrast, in another embodiment of this invention, fabric  23 , depicted in  FIG.  13    and when viewed moving left to right, includes yarns of a first color  24  that are formed into tall loops  28  and  30  having a loop height “T.” The loops of the first color  24  begin to alternate with loops of a second color  26 . Where the first color loops  24  are height “T,” the interspersed second color loops  26  are absent or very short. Progressing to the right, as the first color loops  24  become shorter, the second color loops  26  become taller until the second color loops  26  are height “T,” and the first color loops  24  are very short or absent, as depicted for loops  32  and  34 . Similar, but not necessarily identical, progressions of loop colors and heights can happen in the yarns behind and in front of those depicted schematically in  FIG.  13   , so that such “fuzzy” regions of transition can occur along the web or across the web. Yarns of a first color (or other characteristic) may progress from a maximum tuft height “T” to a minimum tuft height through a progression of any different number of tuft heights. For example, yarns of a first color (or other characteristic) may progress from a maximum tuft height “T” to a minimum tuft height through a progression of at least three different tuft heights. In other embodiments, yarns of a first color (or other characteristic) may progress from a maximum tuft height “T” to a minimum tuft height through a progression of at least five different tuft heights. Similarly, yarns of a second color (or other characteristic) may progress from a minimum tuft height to a maximum tuft height “T” through a progression of any different number of tuft heights, including at least three or at least five different tuft heights. 
     Moreover, similar progressions of loop yarn textures or other qualities or characteristics of the yarn loops can also transition across the face of a carpet tile of this invention to provide visibly discernible “fuzzy” transition regions. 
       FIG.  14    is a schematic elevation view of a tufted fabric  21  comprising a primary backing  22  and yarns of a first height  40  and of a second height  42 . Yarns  40  and  42  may be identical in color, texture and composition, or they may be different in one or more ways in addition their differences in height. Substantially equal-height yarns  40  are side by side and, moving left to right across the drawing, are abruptly replaced at transition line  19  by substantially equal lower-height yarns  42 . If the yarns behind those depicted in  FIG.  14    are the same height and color of those schematically depicted in  FIG.  14   , then the fabric  21 , when seen from above, will exhibit a very clear, “crisp” yarn height transition. 
       FIG.  15    depicts a fabric  25  in which yarns tufts of a first texture  44  abruptly transition to yarn tufts of a second texture  46  at a transition line  19 . If the yarns behind those depicted in  FIG.  15    are the same height and color of those schematically depicted in  FIG.  15   , then the fabric  25 , when seen from above, will exhibit a very clear, “crisp” yarn texture transition. 
     The Hall machine has the ability to move its needle bar laterally as much as the distance between several needles, together with the ability to control yarn feed individually so that a particular tuft can be formed of any height (up to a practical limit) down to “zero” (where there is no tuft present or the yarn is merely “tacked” to the primary backing). These characteristics (together with appropriate yarn thread-up) make it possible to place any of up to several colors, textures or other characteristics of yarn in a given location in the primary backing, and they make it possible to control individually the height (and therefore the visibility) of each yarn placed in the backing. 
       FIGS.  16 - 27    are illustrative of carpet tiles and tile assemblies possible in accordance with this invention. 
     The first three of these simulations ( FIGS.  16 ,  17  and  18   ) are square.  FIG.  16    is a simulated layout image of an assembly  50  of this invention with visually complex, prominent images forming a border  52  around an area of visually less complex, less prominent images  54  that can be thought of as a “field.” As used herein, and as exemplified in  FIGS.  16 - 27   : 
     “Visually complex” refers to patterns of shape, texture, color, tuft height or other properties on the face of a carpet tile or a portion of a carpet tile that are complex and unorganized looking. 
     “Visually less complex” refers to patterns of shape, texture, color, tuft height or other properties on the face of carpet tile or a portion of a carpet tile that are relatively indistinct and subdued, with shapes or other elements that are subtle and less easily seen or that are arranged in simple patterns like rows and columns of dots or other easily seen arrangements of simple shapes. 
     “Prominent” means images, shapes or other elements that are easy to see or otherwise perceive (by, for instance, touch). 
     “Not prominent” means images, shapes or other elements that are not easy to see or otherwise perceive. 
     Visually complex images are often also prominent, but need not necessarily be. Likewise, visually less complex images often are not particularly prominent, but they can be prominent. An example of visually less complex, but prominent images might be a rectilinear arrangement of bright red dots on a light color background. The Figures provide examples of visually complex, prominent images and visually less complex, less prominent images. 
       FIG.  17    is another simulated layout image of an assembly  56  of this invention with a central area or field  58  of visually less complex images surrounded by a wide border  60  of visually more complex images that is itself surrounded by a narrow border area  62  of visually less complex images. 
       FIG.  18    is yet another square simulated layout image of an assembly  64  of this invention with a central area  66  of visually more complex images surrounded by a border  68  of visually less complex images that is itself surrounded by a narrow border area  70  of visually more complex images. 
       FIG.  19    is a simulated layout image of a cruciform assembly  72  of this invention (that might be used, for instance, in a hall) where an elongated portion  74  is bisected by a widened area  76 . The elongated area  74  can utilize carpet tiles with visually less complex images in a central region or field  77  of the elongated area. The central region  78  can be wider in the widened area  76 . A relatively wide border  80  on either side of the elongated area  74  is formed of visually more complex images tends to “define” the central corridor or field area  77  and  78 . 
       FIG.  20    is a simulated layout image of a banquet room with an assembly  81  of this invention with visually complex images forming a border  82  around an area of visually less complex images  84 . 
       FIG.  21    is a simulated layout image of a banquet room with an assembly  86  of this invention with visually less images forming a border  88  around an area of visually more complex images  90 . 
       FIG.  22    is a simulated layout image of a hallway with an assembly  92  of this invention with visually complex images forming a border  94  along the hallway walls beside a central area of visually less complex images. 
       FIG.  23    is a simulated layout image of a hallway with an assembly  98  of this invention with visually less complex images forming a border  100  along the hallway walls beside a central area of visually more complex images  102 . 
       FIG.  24    is a simulated layout image of a hallway with an assembly  104  of this invention with visually complex images in a longitudinally central portion  106  of the hallway and with the remainder of the hallway floor  108  and  110  covered with visually less complex images. 
       FIG.  25    is a simulated layout image of a hallway with an assembly of this invention with, along a first portion of the hallway, visually complex images  114  on one side of the hallway and visually less complex images  116  on the other side and, along a second portion of the hallway, reversed visually less complex images  118  and visually more complex images  120 . 
       FIG.  26    is a simulated layout image of a hallway with an assembly  117  of this invention with visually complex images  119  filling the hallway floor except for a diagonal region of visually less complex images  121 . 
       FIG.  27    is a simulated layout image of a hallway with an assembly  122  of this invention with alternating regions of visually complex images  124  and less complex images  126  and with visually less complex images  126  at the doorways  128 . 
     The gradual or “fuzzy” color or other appearance transition is relatively narrow, it can be challenging to manufacture tiles with the transition falling precisely as desired at the tile edge. One alternative for addressing this manufacturing challenge is to make a considerably larger transition area as follows. 
     The embodiments of this invention depicted in  FIGS.  28 - 31    may be assembled using tiles produced on carpet tile webs utilizing the web patterns shown in  FIGS.  32 - 34   . These web patterns can be used for various sizes of webs and tiles, but may typically be used for a web typically approximately two meters wide, so that four tiles  50  millimeters square can be cut from across a tile web made from this pattern. The pattern repeat is less than two meters so that successive cross-web cuts forming tiles from the web will fall at different places along the web, thereby producing tiles that contain different portions of the pattern along the web. 
     The web patterns of  FIGS.  32 - 34    are similar in certain respects and dissimilar in others. Combined with other features of the tiles of this embodiment of this invention, the web patterns contribute to the production of tiles that generally can be installed facing in any direction without looking out of place and that do not look like tile assemblies because the junctions or seams between tiles are not visible in ways that make the assemblies look like tiles. 
     The  FIGS.  32 - 34    patterns achieve these characteristics of appearance in three principal ways: (a) by production of tufted fabric on the Hall machine or another tufting machine that does not impart discernible pile nap or “lay,” (b) by incorporating in the pattern “false seams,” and (c) by using amorphous-looking, blotchy pattern elements. 
     The  FIGS.  32 - 34    patterns incorporate somewhat randomly located “lines” parallel to tile edges lines  160 ,  162 ,  164  and  166 . The “false seams” of lines  160 ,  162 ,  164   166  and others are created by different yarn colors, different pile height (either higher or lower pile) and with other visual differences. These lines look enough like tile to tile seams that actual seams that are visible simply look like part of the pattern, with the result that a viewer&#39;s attention is not drawn to the actual seams in a manner that makes it apparent that the installation is an assembly of modules rather than a more continuous carpet. 
     In the exemplary patterns of  FIGS.  32 ,  33  and  34   , the pattern of lines (including lines  160 ,  162 ,  164  and  166 ) are the same in all three patterns, but they could also be different. 
     The  FIGS.  32 ,  33  and  34    patterns include sizable, but somewhat amorphous-looking, “patches” or “blobs,” some of which are of solid color or yarn type and others of which are of at least two different colors of yarn or two different yarn visual characteristics of a type other than color. The differences can be differences of color and can be differences of pile height or any other visual differences. 
     The colors shown in the  FIGS.  31 ,  32  and  33    patterns have to do with yarn placement and are not the actual yarn colors used and do not necessarily even correspond to different colors. By contrast,  FIGS.  28 ,  29 ,  30  and  31    show exemplary actual colors in tiles made according to the  FIGS.  31 ,  32  and  33    patterns. In the exemplary tiles depicted in  FIGS.  28 - 31   , each of the  FIGS.  31  and  32    patterns are followed using three different yarn colors, and the  FIG.  33    pattern is followed using two yarn colors. 
       FIGS.  31  and  32    may be rendered in three different yarns, typically different color yarns, with relatively large “blotches,” e.g., blotch  130  of a solid one of the yarns used, or of two or three colors of yarn, like blotches  132  and  134 . The appearance of the pattern of  FIG.  32    is so irregular and amorphous that it is difficult to discern a pattern, which facilitates random installation and repositioning of tiles without any appearing to be out of place and helps to camouflage the flooring seams. 
     The pattern of  FIG.  33    is quite similar to that of  FIG.  32    and also may be rendered in three colors, but there are two longitudinally extending first regions  136  and  138  that extend along the web and contain yarn colors or other characteristics that contrast significantly and noticeably with three other second longitudinally extending regions  140 ,  142  and  144 . While the separately identifiable longitudinally extending regions are clearly visible, demarcation  146  between adjacent regions is somewhat muted. Relatively large (wide and long), very irregular portions e.g.,  145 ,  147  and  149  in each of the regions  136 ,  138 ,  140 ,  142 , and  144  extend toward and interfit with similar irregular portions (e.g.,  151 ,  153 ) in each adjacent region. By contrast with the fuzzy edge  18  described above relative to  FIG.  6   , the scale of the irregular portions (e.g.,  145 ,  147 ,  149 ,  151 ,  153 ) is large enough to make the irregularities relatively easily visible from vantage points from which carpet is typically viewed. 
     As shown in  FIG.  33   , division of a carpet tile web with the pattern of  FIG.  33    into four “columns” of equal-width tiles, along lines  150 ,  152  and  154  will cause a portion of one of the first longitudinally extending regions (e.g.,  136 ) and a portion of one of the second longitudinally extending regions (e.g.,  140 ) to be included on each tile cut from that web. 
     Each of the  FIGS.  32  and  34    web patterns are closely similar to each other and are relatively uniform across the entire web, so there is no demarcation between regions. Moreover, the appearance of tiles cut from the  FIG.  32    pattern may be closely similar to or essentially the same as the appearance of regions  140 ,  142  and  144  of the  FIG.  33    pattern. As a result, all of the tiles cut from a web made according to the  FIG.  32    pattern may look like regions  140 ,  142  and  144  of a web made according to the FIG.  32  33 pattern. Similarly, all of the tiles cut from a web made according to the  FIG.  34    pattern may look like the regions  136  and  138  of the  FIG.  33    web pattern. 
       FIGS.  28 - 31    depict the appearance of carpet tile installations utilizing the three types of tiles  170 ,  172  and  174  produced from the three  FIGS.  32 ,  33  and  34    web patterns, respectively. These tiles can be used to define separate regions on a floor with great flexibility. As can be seen in these  FIGS.  28 - 31   , the  170 ,  172  and  174  tiles can be used to create visually separate floor areas that are generally relatively rectilinear in overall shape (e.g.,  FIG.  28   ) or other areas having a generally curving shape (e.g.,  FIG.  29   ). 
     While other approaches are possible, carpet tiles in accordance with this invention can be produced as described above in which tiles having visually more complex images may be produced with relatively tall loops of yarn, and tiles having visually less complex images can be produced with relatively short or “low” loops of yarn. This causes the yarn depth in the more visually complex areas, as a general proposition, to have taller pile than the pile height in the visually less complex areas. 
     As a result, the different regions of the assemblies  50 ,  56 ,  64  and  72  may not only look different but may also feel and or sound different under foot, thereby providing further “definition” for the different regions of the assemblies. 
     In yet another alternative embodiment, carpet tiles in accordance with this invention can be produced as described above in which tiles can be produced with relatively tall loops of yarn and a particular pattern or no pattern, and tiles can be produced with relatively short or “low” loops of yarn in the same pattern as the taller loop pattern or with no pattern. This results in carpet times with differing pile heights that may feel or sound different underfoot while being visually alike. 
     Carpet tile assemblies of this invention having intended paths or corroders that feel different underfoot can provide subtle but effective guidance to the visually impaired that is visually attractive and practical in accommodating wear and soiling. 
     Where lower height pile areas coincide with or define higher traffic areas of a carpet tile installation in accordance with the present invention, those lower pile height areas may appear to wear less rapidly than would higher pile areas. Furthermore, because the different areas of some of the carpet tile assemblies in accordance with this invention look different by design and before wear or soiling has begun, wear and soiling during use can be less noticeable if it occurs in areas of the assembly that intentionally look different from the lower traffic areas. 
     Different arrangements of the components depicted in the drawings or described above, as well as components and steps not shown or described are possible. Similarly, some features and subcombinations are useful and may be employed without reference to other features and subcombinations. Embodiments of the invention have been described for illustrative and not restrictive purposes, and alternative embodiments will become apparent to readers of this patent. Accordingly, the present invention is not limited to the embodiments described above or depicted in the drawings, and various embodiments and modifications can be made without departing from the scope of the claims below.