This invention generally relates to a set of parallelepipedal bodies (cubes) capable of matingly compatible engagement for interconnection with substantially similar cubes or matingly conformed rails, so as to allow up to three degrees of freedom in the sliding movement of an individual cube or grouping of cubes about a grouping of other interconnected cells from the set. Each cube is constructed from six plates or from three plate pairs. The interior physical configuration of tabs and slots lends itself to injection molding of plates or plate pairs. The exterior physical configuration of all plates and at least one of the exterior surfaces of the rails are substantially similar. When a number of cubes are assembled into a cubic array, there can be slab movement, row movement or solo cube movement.