while the invention will be described in connection with a preferred embodiment , it will be understood that it is not intended to limit the invention to this embodiment . on the contrary , it is intended to cover all alternatives , modifications and equivalents as may be included within the spirit and scope of the invention . the present invention is directed to furniture modules capable of being used individually or being interlocked to form shelving , a bench , or other articles . the modules can also be effectively stacked atop each other . the furniture modules of this invention may be made of any material , although plastics , metal and woods are preferred because in appropriate types they are light in weight , strong and low in cost . furthermore , the furniture modules of this invention may be scaled to any size , so long as relevant dimensions described hereafter remain in proportion . although various modules may , in their final form , appear in different colors and with different design patterns , in the preferred embodiment , all of modules have the same height and shape . in accordance with the invention , each furniture module 9 is comprised of a preferably square top surface 10 , a first set of one or more legs 11 , and a second set of at least two legs 12 . both the first set of legs and the second set of legs extend downward from opposing sides of the surface and are preferably offset from the surface edges as illustrated . in the preferred embodiment illustrated in fig1 , the surface 10 has a single leg 11 extending downward from one side of the surface 10 and two legs 12 extending downward from the opposite side of the surface 10 . as illustrated in fig1 , the first leg 11 has a predetermined width a between its outermost surfaces 13 . in another embodiment of the invention , multiple legs could replace the unitary first leg 11 . however , in such an embodiment , the predetermined width between the outermost surfaces of the outermost legs must remain a . referring back to fig1 , the two legs 12 are spaced apart from each other , creating a void of width b between the innermost leg surfaces 14 . the width b must be greater than or equal to the predetermined width a in order to accommodate insertion of the first leg 11 at an adjacent but ( here ) identical module 9 into the void created by the separation of the two legs 12 , as illustrated in fig2 . although the preferred embodiment discloses the use of two legs to create the void , any number of legs may be used so long as the width between the innermost surfaces of the innermost legs remains width b . in the preferred embodiment of fig2 , the modules interlock . this is accomplished in the preferred embodiment by offsetting the first leg 11 from the surface edge 15 and by offsetting the two legs 12 from the surface edge 16 , as illustrated in fig1 . the offset first leg 11 of a first module is inserted into the void created by the offset two legs 12 of a second module , thus preventing lateral movement . longitudinal movement can be prevented by providing interlocking dovetail formations ( not shown ) in the leg surfaces 13 and 14 . alternatively , the invention includes placement of the legs directly underneath the surface , rather than in an offset position . in this embodiment , the legs of a first module ( not shown ) would be positioned outside or beyond the perimeter of the surface of a second , nested module . this second module would nest within the void between the innermost surfaces of the legs of the first module . this would also result in interlocking modules that prevent lateral movement . in accordance with a further aspect of this invention , fig1 illustrates that the space between the first leg 11 and the two legs 12 has a predetermined length x . the maximum width y of the surface 10 is less than or equal to the predetermined length x . as shown in fig3 , this spacing permits the stacking of a first module 31 upon a second module 32 , with the first module 31 oriented at 180 degrees with respect to the second module 32 . this arrangement increases the height of the combined structure by only the height h of the surface 10 and thus maximizes storage space . as further illustrated in fig3 , by orienting a third module 33 at ninety degrees in either direction with respect to the second module 32 , the third module 33 may be stacked upon the second module 32 . in addition , by stacking a fourth module oriented at 180 degrees in either direction with respect to the third module 33 , a stacking unit 30 is created . the entire configuration can be locked in place by placing a fifth module atop the stack , as illustrated in fig3 . repetition of this process permits the stacking of an indefinite number of furniture modules . fig4 illustrates an embodiment of yet another aspect of this invention . fig4 depicts an embodiment of a shelving unit 40 created through the combination of two identical shelf modules 41 . these modules 41 are identical in configuration with the modules in fig1 - 3 . each shelf module 41 includes a side surface 42 , a top leg 43 , and two bottom legs 44 . the top leg 43 and the bottom legs 44 extend perpendicularly to the side surface 42 in the same direction . the top leg 43 is designed with a predetermined width w . the bottom legs 44 are spaced apart so that the width between the innermost surfaces of the two legs is v , a distance greater than or equal to the predetermined width w . as seen in fig5 , the spacing is such that the top leg 53 of one shelf module 51 will nest within the space between the bottom legs 54 of a second shelf module 52 , effectively interlocking shelf module 51 and shelf module 52 . the shelf modules of fig4 are configured and oriented so that the top legs 43 and the bottom legs 44 of two shelf modules 41 confront each other . the combination of the two shelf modules in this orientation constitutes a shelving unit . although the shelving unit depicted in fig4 is the preferred embodiment , multiple variations can be created . as an example , any number of legs may be used as a substitute for the top leg or the bottom legs , so long as the space between the innermost surfaces of the innermost bottom legs remains greater than or equal to the width of the outermost opposing surfaces of the outermost top legs . aside from this spacing limitation , the shelving units 41 may come in any size or shape . however , each shelf module 41 must be substantially identical in size and shape when compared to the other modules . the shelving units of fig4 can be combined into a variety of structures , some of which are illustrated in fig5 and 6 . to accomplish this , all shelving units and shelf modules used to create the shelving structure are oriented in the same direction . the shelving units should be oriented so that at least one flat surface of the shelving unit is parallel to the ground . as illustrated in fig5 , each shelving unit 41 is oriented such that the top legs 43 face down and the bottom legs 44 face up . a number of shelving units are placed side by side so that the side surface 42 of one shelving unit 43 abuts the side surface 42 of another shelving unit 41 . another second - level shelving unit 41 may be placed atop the ground level shelving units 41 just described . the second - level shelving unit 41 is centered above the point where the side surfaces 42 of the ground level shelving units 41 meet . the top legs 43 of the second - level shelving unit 42 nest within the space created by the bottom legs 44 of the ground level shelving units 41 , interlock all of the shelving units and preventing lateral movement . due to this spacing , it is necessary to fill out the second level with a single shelf module 41 at each end . as before , the side surface 42 of the shelf module 41 abuts the side surface 42 of the adjacent shelving unit 41 and the top leg 43 of the shelf module 41 interlocks with the bottom legs 44 of the ground level shelving unit . by repeating this process , a shelving structure of indefinite length and height can be achieved . the same approach may be used by rotating the shelving units and shelf modules in any direction , so long as one surface remains parallel to the ground . in the further embodiment of fig6 , the same approach is used , however the shelving units 11 are oriented such that the top legs 44 face up and the bottom legs 43 face down . although the preferred embodiments illustrated in the drawings show square surfaces , invention comprehends any shaped surface that permits attachment of the required leg structures . furthermore , except where otherwise required , the legs need not be perpendicular to the surface , but may extend from the surface at any angle so long as the required proportional dimensions are not violated . while the invention has been described in a preferred form , it will be understood that changes , additions , and modifications may be made to the respective articles forming the invention . accordingly , no limitation should be imposed on the scope of this invention , except as set forth in the accompanying claims .
interlocking , stackable articles of furniture are disclosed . the individual components may be used separately , interlocked end to end , stacked in various orientations to create shelving structures , or stacked vertically as a single upstanding unit .