located along the periphery of the flat plate element the elements may be affixed together by gluing or other suitable methods known in the art it is also possible to form a flat plate element with cavities by injection molding or similar processes known in the art in the preferred embodiment the flat plate elements measure 15 5 by 15 5 inches but it should be understood that alternative size elements are possible and encouraged however at least one side of each flat plate element must have identically spaced cavities for another element to connect to it a flat plate element with only one side containing cavities may have the other three sides cut to represent various ornamental designs such as the top of a building or the like alternatively the other three sides may only have a thin edge with a cutout to represent a window or the like fig2 illustrates a flat plate surface element 2 of a different width than surface element 1 fig4 illustrates a flat plate interior element 2 a with symmetrical semi circular recesses due to a narrower width only one cutout is required on the short side in the preferred embodiment flat plate interior element 2 a measures 15 5 inches long by 7 inches wide it should be understood that multi dimensioned flat plate elements may be created to form different building block elements it should be further understood that the number of flat plate interior element 1 a recesses can be less or more depending on the desired structural stability of the interconnected flat plate elements furthermore it should be understood that cavities of different geometry 39 s e g square rectangular triangular etc may be formed within the flat plate elements as long as.