Abstract: A plurality of modules that are generally P-shaped and are of the same size and shape which may be arranged in different stacked relationships to form book cases or the like. As to each module, the closed loop of the P is of a generally rectangular box-shape construction while the leg of the P extends outwardly of the closed loop coextensive and coplanar with one side of the closed loop. The modules are stacked so that the walls thereof are inclined. Optionally shelves may be mounted by the closed loops.