Abstract: A design and construction module comprised of nine cells each having substantially equal lengths, widths and heights and longitudinally opposed ends. Two of the cells form the base of the module and are located side-by-side with their ends terminating adjacent and flush with one another. Three of the cells form an intermediate level of cells located above the base cells. Two of these intermediate cells correspond with the two base cells and are located immediately thereabove, but longitudinally offset. In this way these two intermediate cells extend a predetermined distance beyond the one end of the base cells in an overhang. Opposite the overhang, the third cell of the intermediate cells extends transversely with respect to the two other intermediate cells and the base cells. A portion of the third intermediate cell therefore laterally extends beyond the side of the base cells. Three additional cells define a common top surface of the module.