Patent Publication Number: US-2007122773-A1

Title: Activity system for drawing and viewing 3-dimensional images

Description:
The present invention relates to graphical systems, and more specifically to a system for forming and viewing three-dimensional images.  
      Three-dimensional or “3-D” movies and images are known and have been enjoyed by many since the 1950s. However, it is believed that there has been no device or kit for making and enjoying such images available to an average user or consumer.  
     SUMMARY OF THE INVENTION  
      In one aspect, the present invention is an activity system for drawing and/or writing on a fixed medium. The system comprises a drawing device manually operable by a user and configured to form a first graphic line of a first color on the medium and a second graphic line of a second color on the medium, such that the second line is spaced apart from and extends generally parallel with the first line. A viewer has a first generally transparent portion of the first color and a second generally transparent portion of the second color. The viewer is positionable generally adjacent to the user&#39;s face such that the first and second lines formed by the drawing device are viewable by the user through the two generally transparent portions.  
      In another aspect, the present invention is an activity kit comprising a medium including at least one material sheet with a first set of spaced-apart marks and a second set of spaced-apart marks. Each mark of the second set is located generally proximal to and spaced apart from a separate one of the marks of the first set by a predetermined distance. The kit may include a drawing device configured to form a first graphic line of a first color on the medium and a second graphic line of a second color on the medium. Alternatively, the kit may include a first drawing implement configured to form lines of the first color and a second drawing implement configured to form lines of the second color.  
      In a further aspect, the present invention is an activity kit for drawing images on a fixed medium. The kit comprises either a drawing device as described above or at least two, first and second drawing implements, as is also described above. The kit also includes a viewer having a first generally transparent portion of the first color and a second generally transparent portion of the second color. The viewer is configured to be worn on the user&#39;s head such that first and second lines formed by the drawing implement are viewable through each one of the two generally transparent portions. 
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS  
      The foregoing summary, as well as the detailed description of the preferred embodiments of the present invention, will be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, there is shown in the drawings, which are diagrammatic, embodiments that are presently preferred. It should be understood, however, that the present invention is not limited to the precise arrangements and instrumentalities shown. In the drawings:  
       FIG. 1  is a perspective view of an activity system of the present invention, showing a drawing device forming two lines and being viewed by a user wearing a viewer;  
       FIG. 2  is front plan view of one construction of a drawing device;  
       FIG. 3  is a cross-sectional view of the drawing device of  FIG. 2 ;  
       FIG. 4  is a front plan of another construction of the drawing device including two clip holder devices and shown with additional drawing implements;  
       FIGS. 5A and 5B , collectively  FIG. 5 , are each a front plan view of a separate, exemplary construction of the clip holder of the drawing device of  FIG. 4 ;  
       FIGS. 6A and 6B , collectively  FIG. 6 , are each a top plan view of a separate one of the two alternative exemplary holders of  FIG. 5 ;  
       FIG. 7  is a front elevational view of a further construction of the drawing device including a sleeve holder device;  
       FIG. 8  is a top view of the sleeve holder device of  FIG. 7 ;  
       FIG. 9  is a longitudinal cross-sectional view of the sleeve holder device of  FIG. 7 , showing an exemplary retainer;  
       FIGS. 10A and 10B , collectively  FIG. 10 , are each a separate radial cross-sectional view through line  10 - 10  of  FIG. 9 , showing retention and release positions of the retainer device;  
       FIG. 11  is a side perspective view of yet anther construction of the drawing device including two finger drawing implements, shown on two of the user&#39;s fingers;  
       FIG. 12  is a cross-sectional view of one finger drawing implement of  FIG. 11 ;  
       FIG. 13  is a front plan view of one construction of the viewer;  
       FIG. 14  is a side perspective view of the viewer of  FIG. 13 ;  
       FIG. 15  is a front plan view of another construction of the viewer;  
       FIG. 16  is a front plan view of the viewer of  FIG. 15 , shown with a pane removed and another pane being installed;  
       FIG. 17  is a top plan view of the viewer of  FIG. 15 ;  
       FIG. 18  is a front perspective view of an exemplary media of a second embodiment of the present invention;  
       FIG. 19  is a front perspective view of a set of first lines being formed on the media of  FIG. 18 ;  
       FIG. 20  is a front perspective view of a set of second lines being formed on the media of  FIG. 18 ; and  
       FIG. 21  is a front perspective view of a finished image formed on the media of  FIG. 18 , shown being observed by a user. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
      Certain terminology is used in the following description for convenience only and is not limiting. The words “right”, left”, “lower”, “upper”, “upward”, “down” and “downward” designate directions in the drawings to which reference is made. The words “inner” and “outer” refer to directions toward and away from, respectively, a designated centerline or a geometric center of an element being described, the particular meaning being readily apparent from the context of the description. Further, as used herein, the word “connected” is intended to include direct connections between two members without any other members interposed therebetween and indirect connections between members in which one or more other members are interposed therebetween. The terminology includes the words specifically mentioned above, derivatives thereof, and words of similar import.  
      Referring now to the drawings in detail, wherein like numbers are used to indicate like elements throughout, there is shown in  FIGS. 1-17  an activity system  10  for drawing and/or writing on a fixed medium  1 , in accordance with a first embodiment of the present invention. The medium  1  may include a single sheet of material  2  (e.g., paper), a booklet including a plurality of material sheets  2 , a drawing board or an erasable board (neither shown), or any other medium capable of accepting a fixed graphic line or image, as opposed to an electronic or other temporary graphic image/line (e.g., computer graphics). The activity system  10  basically comprises at least one drawing device  14  and a viewer  16 , and may additionally include medium  1  as part of the kit  12 . The drawing device  14  is manually operable by a user U and is configured to form a first graphic line  20 A of a first color C 1  (e.g., red) on the medium  1  and a second graphic line  20 B of a second color C 2  (e.g., blue) on the medium  1 . The drawing device  14  is configured such that the second line  20 B is spaced apart from and extends generally parallel with the first line  20 A, such that the two lines  20 A,  20 B are spaced apart by a substantially constant distance d L , and is preferably configured to simultaneously form the first and second lines  20 A,  20 B, as described below. Additionally, the drawing device  14  may be selectively configurable to form at least one third graphic line  20 C of a third color C 3  (e.g., green) on the medium  1  (or a fourth, fifth, sixth line, etc.) such that the third line  20 C is spaced apart from and extends generally parallel with either one first line  20 A or one second line  20 B. Further, the drawing device  14  is preferably configured to be manually grasped by the user U, but may alternatively be constructed so as to be attachable to one of the user&#39;s hands ( FIGS. 7 and 8 ), specifically one or more fingers, as discussed below.  
      Furthermore, the viewer  16  has a first generally transparent portion  22 A of the first color C 1  and a second generally transparent portion  22 B of the second color C 2 . The viewer  16  is positionable generally adjacent to the user&#39;s face such that the first and second lines  20 A,  20 B formed by the drawing device  14  are viewable by the user through the two generally transparent portions  22 A,  22 B. Preferably, the viewer  16  is configured to be worn on the user&#39;s head such that the first transparent portion  22 A is disposed forwardly of one of the user&#39;s eyes (e.g., left eye) and the second transparent portion  22 B is disposed forwardly of the other one of the user&#39;s eyes (i.e., right eye). However, the viewer  16  may be alternatively formed as a handheld device which a user places forwardly or the user&#39;s eyes or a stationary device against which a user positions the user&#39;s face (neither alternative depicted).  
      In any case, the viewer first transparent portion  22 A is configured to filter light of the first color C 1  and the second transparent portion  22 B is configured to filter light of the second color C 2 . As such, the viewer  16  is configured to create in the user U a mental impression that the first line  20 A is disposed in a first plane and the second line  20 B is disposed in a second plane, the second plane being spaced apart from the first plane. In other words, when the user U views the first and second lines  20 A,  20 B through the viewer device  16 , at least one of the two lines  20 A,  20 B appears closer to the user than the other line  20 B,  20 A, and/or appears to be spaced above the medium  1 . This phenomena occurs because each eye (e.g., the left eye) only sees one of the two lines (i.e.,  20 B) since the transparent portion (i.e.,  22 A) disposed forwardly of that particular eye blocks the image of the other line (i.e.,  20 A), which is of the same color as the transparent portion. With both transparent portion  22 A,  22 B only allowing the adjacent eye to “see” a different one of the two lines  20 B,  20 A, respectively, the two lines  20 A,  20 B appear to float or to be “lifted” off of the medium  1 .  
      Preferably, each one of the first and second transparent portions  22 A,  22 B includes a generally transparent pane  26 A,  26 B, respectively, each pane  26 A,  26 B being formed of a material of the first and second colors C 1 , C 2 , respectively. Also, each of the first and second panes  26 A,  26 B is either attached to a remainder of the viewer  16 , as depicted, or may be integrally formed with the remainder of the viewer  16  (not depicted). Preferably, the viewer  16  further includes a frame  28  with two view apertures  29 . The frame  28  is mountable to the user&#39;s head and configured to retain the first and second panes  26 A,  26 B such that each pane  26 A,  26 B is disposed within and/or extends across one view aperture  29 . As such, when the frame  28  is mounted to the user&#39;s head, the first pane  26 A is positioned generally forwardly of one of the user&#39;s eyes and the second pane  26 B is positioned generally forwardly of the other one of the user&#39; eyes. Further, each pane  26 A,  26 B may be formed as or provided by a film, a panel, a lens, etc., and the frame  28  is preferably generally similar to an “eyeglass” frame  30 . Specifically, the eyeglass frame  30  includes a main frame portion  32  and two side members or arms  34 . The main frame portion  32  is configured to retain the preferred first and second panes  26 A,  26 B and has a central “nose” support section  33  disposeable upon the bridge of the user&#39;s nose. Each frame arm  34  has a first end  34   a  connected with the main frame portion  32  and a second end  34   b  configured to “hook” about one of the user&#39;s ears. Specific details of exemplary viewer constructions are described below.  
      Referring to  FIGS. 2 and 3 , in certain constructions, the drawing device  14  is an “integrated” drawing device  38  that includes a housing  40 , first and second fluid or “ink” reservoirs  42 A,  42 B, and first and second applicator tips  44 A,  44 B. The housing  40  preferably includes a generally tubular body  41  of appropriate cross-sectional shape (e.g., rectangular, ovular, etc.) and having upper and lower ends  41   a,    4   ab,  respectively and an interior cavity  43 . The first and second fluid/ink reservoirs  42 A,  42 B are disposed within the housing interior cavity  43  in a “side-by-side” relationship and each includes a generally elongated tubular body  51  with an interior fluid chamber  47 . Further, the first fluid reservoir  42 A contains a quantity of fluid, preferably a commercially available ink  48 A, of the first color C 1  and the second reservoir  42 B contains a quantity of fluid/ink  48 B of the second color C 2 . Furthermore, each of the first and second applicator tips  44 A,  44 B extends outwardly from the housing lower end  41   b  and is fluidly connected with an associated one of the first and second reservoirs  42 A,  42 B, respectively, such that each connected reservoir  42 A,  42 B and tip  44 A,  44 B forms a pen unit  51 A,  51 B, respectively.  
      The first applicator tip  44 A is configured to dispense the first ink  48 A so as to form at least one first line  20 A, and the second tip  44 B is configured to dispense the second ink  48 B so as to form at least one second line  20 B. The second tip  44 B is spaced from the first tip  44 B, and the two tips  44 A,  44 B are preferably simultaneously disposeable upon the medium  1 , such that the two lines  20 A,  20 B are simultaneously formable upon the medium  1 . Furthermore, each tip  44 A,  44 B may include a pressure valve (not depicted) permitting the ink  48 A,  48 B to flow out the tip ends  49  when pushed against the medium, generally in the manner of a ball point pen, the tips  44 A,  44 B may be formed as a saturateable felt tip (not depicted) in the manner of a magic marker or highlighter, or may have any other appropriate mechanism for controlling the release of ink or other colored fluid from the associated reservoir  42 A,  42 B.  
      Additionally, the integrated drawing device  38  may be constructed with one or more additional pen units (none shown), the drawing device  38  being configured to selectively position two pen units  51 N onto the medium  1 . For example, the integrated drawing device  38  may be constructed similarly to a commercially available “multicolor pen” including three or more pen units  51 N selectively advanceable to extend partially out of the housing  40  (structure not shown). However, unlike a commercial multicolor pen, the drawing device  38  is configured to lock two pen units  51 N (e.g.,  51 A,  51 C) into a position such that two spaced apart applicator tips  44 N are simultaneously disposeable upon the medium  1 , while the one or more other tips  44 N are retracted within the housing  40 .  
      In other constructions as depicted in  FIGS. 4-6 , the drawing device  14  may be constructed as a “modular” drawing device  50  so as to include separate first and second drawing implements  52 A,  52 B and a holder  54  configured to receive each of two drawing implements  52 A,  52 B. Each of the first and second drawing implements  52 A,  52 B is preferably a conventional drawing implement, such as a pen, a magic marker, a pencil, a highlighter, or other similar device, and each has an applicator tip  53  as appropriate for the type of device (e.g., ball point tip, saturated felt tip, pencil lead end, etc.). The first drawing implement  52 A is configured to form at least one and preferably a plurality of first lines  20 A and the second drawing implement  52 B is configured to form one or more second lines  20 B. Further, the holder  54  is configured to connect the two implements  52 A,  52 B such that the tip  53 A,  53 B of each one of the implements  52 A,  52 B, respectively, is spaced apart from and located generally adjacent to the tip  53 B,  53 A of the other one of the two implements  52 B,  52 A. As such, when the tips  53 A,  53 B are placed upon the medium  1  and pulled or “drawn” thereacross, the drawing device  14  simultaneously forms the first and second spaced apart lines  20 A,  20 B.  
      The holder  54  may be constructed in any appropriate manner that is capable of receiving and connecting together two drawing implements  52 A,  52 B as discussed above. Preferably, the holder  54  is configured to removably connect the two drawing implements  52 A,  52 B; as such, the activity system  10  may be provided as a kit  12  that further includes a third drawing implement  52 C, a fourth drawing implement  52 D, and/or any additional number of implements  52 N. Specifically, the kit  12  may include a third drawing implement  52 C configured to form at least one line of a third color C 3  and having an applicator tip  53 C, a fourth drawing implement  52 C configured to form at least one line of a fourth color C 4  and having an applicator tip  53 D, etc. The holder  54  is configured to receive the third and/or fourth drawing implements  52 C,  52 D when one (or both) of the first and second implements  52 A,  52 B is separate from the holder  54 . The holder  54  thereby connects the third implement  52 C (and/or fourth implement  52 D) with one of the first and second implements  52 A,  52 B (or/and fourth or third implements  52 D,  52 C). As such, the third applicator tip  53 C or fourth applicator tips is spaced apart from and located generally adjacent to the applicator tip  53 A,  53 B (or  53 D,  53 C) of the connected one of the other implements  52 A,  52 B,  52 C or  52 D. As such, either or both of the first and second lines  20 A,  20 B may be formed of the third color C 3  or the fourth color C 4 , particularly when the kit  12  includes removable and interchangeable transparent portions  20  or panes, as described below.  
      Still referring to  FIGS. 5 and 6 , in one exemplary construction, the holder  54  is formed as one or more clip devices  56  each having two C-clip portions  58  configured to releasably attach to a separate one of the drawing implements  52 N and a central base portion  58  integrally connecting the two clip portions  58 . Specifically, each C-clip portion  58  defines a cavity  57  sized to receive a portion of one drawing implement  52 N, and is bendable with respect to the base portion  60  to permit an implement  52 N to be installed within and removed from the clip cavity  59 . In other words, the each C-clip portion  58  has an inner diameter sized slightly lesser than the outside diameter of the particular model or type of drawing implements  52 N for which the clip  54  is constructed, such that each clip portions  58  frictionally engages with the outer surface of one drawing implement  52 N. In a first construction shown in  FIGS. 5A and 6A , each C-Clip portion  58  extends from the same side of the base portion  60 ; alternatively, in the second construction depicted in  FIGS. 5B and 6B , the C-Clip portions  58  extend from opposing sides of the base portion  60 , which is much thinner and includes less material than the first construction base  60 . Further, the clip device  56  may be constructed to engage one or specific sizes of commercially available drawing implements, or may be formed to be used with specially manufactured implements provided in a kit  12 . Furthermore, with the exemplary clip holder  56 , it is preferred to use at least two clip holders  56  spaced apart on the two drawing implements  52 N to prevent twisting or other relative movement of the implements  52 N, although one clip holder  56  is adequate to secure together two implements  52 A,  52 B,  52 C, or/and  52 D, etc.  
      Referring now to  FIGS. 7-10 , in another exemplary construction, the holder  54  is formed as a sleeve device  90  that includes a tubular body  91  with opposing upper and lower ends  91  a,  91   b  and configured to receive two drawing implements  52 N such that the applicator tips  53 N extend from the body lower end  90   b . The holder body  91  preferably has a generally ovular cross-sectional shape, as best shown in  FIGS. 8 and 10 , and defines a central cavity  93  for receiving at least a portion of two drawing implements  52 N. Preferably, the sleeve holder  90  further comprises a least one and preferably two guide plates  94  disposed within the body cavity  91 , each plate  94  having openings  95 A,  95 B sized to receive a portion of one drawing implement  52 N, and a retainer  96  configured to releasably retain the two drawing implements  52 N within the cavity  93 . In one exemplary construction, the retainer  96  is a generally elliptical spring device  97 , as depicted in  FIGS. 9 and 10 , although the retainer  96  may be formed in any other appropriate manner. The exemplary retainer spring device  97  includes two retaining arms  98 , which define two cavities  99  for receiving the implements  52 N, and a pair of button members  100  extending through openings  102  in the holder body  91 . The two arms  98  each having opposing ends  98   a ,  98   b  connected with the corresponding end  98   a ,  98   b  of the other arm  98 , preferably integrally formed, the two arms  98  being biased toward each other by material elastic forces to retain the implements  52 N with the cavities  99  (see  FIG. 10A ). Referring to  FIG. 10B , when it is desired to remove the drawing implements  52 N from the sleeve holder  90 , a user pushes the two buttons  100  toward each other, causing the spring device  97  to deflect radially outwardly and move the retainer arms  98  away from each other, thereby permitting the implements  52 N to slide free from the sleeve body  91 . However, the sleeve holder  90  may include any other device or component for retaining the drawing implements  52 N within the tubular sleeve body  91 , such as for example, by forming the guide plate(s)  94  to frictionally retain the implements within the plate openings  95 A,  95 B. Furthermore, the sleeve body may be formed as a generally cylindrical body (not shown) with a pair of longitudinal bores for receiving the two implements  52 N, and an appropriate mechanism for releasably retaining the implements therein.  
      Although two exemplary holders  54  are depicted as a clip device  56  and sleeve device  90 , these particular constructions are provided for purposes of illustration of the present invention. Thus, the holder  54  may be constructed in any other appropriate manner capable of releasably or removably securing together two implements  52 N such that the tips  53 N thereof are spaced apart to form the two parallel lines  20 A,  20 B, etc. For example, the holder  54  may be constructed as a block or bar with two holes each sized to receive one implement  52 N, as one or more elastic bands securable about two implements  52 N, etc. The scope of the present invention is not limited to any particular construction of the holder  54  and includes all appropriate constructions capable of permitting the activity system  10  to function generally as described herein.  
      Referring now to  FIGS. 11 and 12 , the drawing device  14  may alternatively include first and second drawing implements  80 A,  80 B attachable to the user&#39;s fingers. Specifically, a first finger drawing implement  80 A is configured to attach to one of a user&#39;s fingers F 1  (e.g., the index finger) and to form at least one first line  20 A, and the second finger drawing implement  80 B is configured to attach to another one of the user&#39;s fingers F 2  (e.g., middle finger) and to form at least one second line  20 B. The finger drawing implements  80 A,  80 B may either be completely separate devices (as depicted) or may be connected together or integrally formed (neither shown), so as to facilitate forming lines  20 A,  20 B that are more truly parallel and uniformly spaced apart. In the exemplary construction of  FIGS. 11 and 12 , each finger implement  80 A,  80 B includes a body  82  with an upper cavity  84  sized to receive a user&#39;s finger tip and a lower cavity  86 , a fluid reservoir  88  containing a quantity of ink  89  or other drawing/marking fluid, and an applicator tip  90  fluidly connected with the reservoir  88 . Each finger implement  80 A,  80 B includes ink  89  of a color C N  different than the other implement  80 B,  80 A, so that the first and second lines  20 A,  20 B are of different colors C 1 , C 2 , etc., as discussed above. It must be noted that the finger drawing implements  80 A,  80 B as described herein and depicted in  FIGS. 7 and 8  are provided as one exemplary construction, and the finger drawing implements  80 A,  80 B may be of any other appropriate structure that functions as basically described herein.  
      Referring to  FIGS. 13 and 14 , in certain constructions, the viewer  16  is formed generally similarly to commonly known “3-D glasses” provided by movie theatres when displaying a “3-D movie”. Specifically, in such a viewer construction, the eyeglass frame  30  may be formed of cardboard, paper, or other disposeable material, and the panes  26 A,  26 B are preferably formed of a polymeric film (e.g., celluloid) or other similar material and are fixedly attached to the frame  30  by any appropriate means, such as glue, friction, staples, etc. As such, the viewer  16  is relatively low cost to manufacture and lightweight, but may be less durable than other potential designs.  
      Referring to  FIGS. 15-17 , in other constructions, the viewer  16  may be formed generally similarly to conventional eyeglasses or sunglasses, except that it is preferred that the panes  26 A,  26 B have no “focusing” capability. As such, the frame  30  is preferably formed of a generally rigid material, such as a molded polymer or lightweight metal, and the panes  26 A,  26 B are formed of colored glass, colored plastic or other polymeric material, or any other appropriate material, and are mounted to the frame  30 . In certain structures, the panes  26 A,  26 B may be fixedly attached to the frame  30  by adhesives, threaded fasteners, rivets, frictional retention, or any other appropriate means, such that the panes  26 A,  26 B are non-removable. Alternatively, as depicted in  FIGS. 16 and 17 , the frame  30  and panes  26 N are constructed such that the panes  26 A,  26 B are each removably mountable to the frame  30 , so as to be readily removable from and installable within the frame  30 , and the viewer  16  is preferably provided with one or more additional panes  28 C (only one shown).  
      Specifically, the viewer  16  may further include at least a third generally transparent pane  28 C of a third color C 3  (e.g., green) different than the first and second colors C 1 , C 2 , the third pane  28 C being removably mountable to the frame  30  when one of the first and second panes  26 A,  26 B is separate from the frame  30 . The viewer  16  may include any number of additional panes, such as a fourth pane of a fourth color, a fifth pane of a fifth color, etc. (none shown). For example, the main frame portion  32  may be provided with vertically-extending slotted openings  36  each sized to receive one pane  26 A,  26 B, etc., such that each panel  26 N is retained between spaced apart, front and rear edge retaining sections  37   a ,  37   b  of the main frame portion  32 . Further, such a viewer  16  is preferably used with a drawing device  14  including three or more selectively useable pen units  51 N or having or three or more separate implements  52 A,  52 B,  52 C, etc. (see  FIG. 4 ). That is, when a drawing device  14  is capable of producing lines  20 A,  20 B,  20 C, etc. selected from three or more different colors C 1 , C 2 , C 3 , etc., the viewer  16  should be configurable or adjustable such that the color of each transparent portions  22 A,  22 B corresponds with the specific color of one of the two lines  20 A,  20 B or/and  20 C, etc.  
      Referring now to  FIGS. 18-21 , an activity kit  70  of a second embodiment of the present invention includes a medium  72  with at least one and preferably a plurality of material sheets  74  each having first and second sets  75 A,  75 B of spaced apart marks  76 A,  76 B, respectively, a viewer  16  as described above, and either a drawing device  14  or two or more separate or individual drawing implements  78 A,  78 B. The first and second sets of marks  76 A,  76 B are formed on each material sheet  74  such that each mark  76 A of the second set  75 A is located generally proximal to and spaced apart from a separate one of the marks  76 A of the first set  75 A by a predetermined distance D S , and vice-versa. That is, each mark  76 A,  76 B of each set of marks  75 A,  75 B is spaced apart from an associated mark  76 B,  76 A of the other set  75 B,  75 A by the same distance D S . Further, the drawing device  14  is configured to form a first graphic line  20 A of a first color C 1  on the medium  72 , i.e., each of the one or more sheets  74 , and a second graphic line  20 B of a second color C 2  on the medium  74 /sheet  74 . As such, a single drawing device  14  may be used to simultaneously connect each adjacent pair of marks  76 A of the first set  75 A and each adjacent pair of marks of  76 B of the second set  75 B. Alternatively, the kit  70  may include a first drawing implement  78 A configured to form lines of the first color C 1  and a second drawing implement  78 B configured to form lines of the second color C 2 .  
      Further, the two sets  75 A,  75 B of marks  76 A,  76 B are disposed or located on the medium  72  such that when a first line  20 A is drawn between each pair of generally adjacent first marks  76 A, and a second line  20 B is drawn between each pair of generally adjacent second marks  76 B, two parallel images  80 A,  80 B of an object (e.g., a house, as depicted) is formed, each image  80 A,  80 B being of a separate color C 1 , C 2 . Specifically, each image  80 A,  80 B includes a plurality of lines  20 A,  20 B, respectively, and each line  20 A,  20 B extends parallel to, and is spaced by a distance D L  ( FIG. 20 ) from, an associated line  20 B,  20 A. Once formed, the user U may view the images  80 A,  80 B through the viewer  16 , and experience the lift phenomena as described above, as depicted in  FIG. 21 ).  
      Additionally, the drawing kit  72  preferably further comprises printed instructions  82  (e.g., consecutive numbers, letters, symbols, etc.) on the medium  72  directing a user to draw one first line  20 A between each pair of marks  76 A of the first mark set  75 A and to draw one second line  20 B between each pair of marks  76 B of the second mark set  75 B. Preferably, a printed number N is preferably located adjacent to each mark  76 A,  76 B of each set  75 A,  75 B, the printed numbers N increasing incrementally such that a user is directed to draw lines  20 A,  20 B between the marks  76 A,  76 B in a specific, desired order. Thus, a user U uses either the single device  14  or the two implements  78 A,  78 B to connect the marks  76 A,  76 B in the specific sequence by following the number order, generally in the manner of a “connect the dots” drawing. Either the marks  76 A,  76 B of the two sets  75 A,  75 B of marks are simultaneously connected by a single drawing device  14 , and thus each associated pair of marks  76 A/ 76 B has a single number N, or each set  75 A,  75 B is connected by a separate implement  78 A,  78 B, such that the two sets of marks  75 A,  75 B are separately numbered. Further, the activity kit  70  preferably includes a plurality of medium  72  provided by a book  84  ( FIG. 18 ) having a plurality of the material sheets  74 , similarly to commercially available activity books, but may alternatively be provided as one or more separate sheets  74 .  
      It will be appreciated by those skilled in the art that changes could be made to the embodiments described above without departing from the broad inventive concept thereof. It is understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications within the spirit and scope of the present invention as defined in the appended claims.