Abstract: A structure formed with a hardened outer casing shaped with a rectangular cross-section. The outer casing may be formed of concrete which includes a wire mesh core shaped to maintain the rectangular cross-section. The outer casing includes front and back walls separated by an insulating core which includes at least two insulating layers, such as styrofoam, located adjacent the front and back faces. The insulating layers are spaced apart with shims to form a dead air space therebetween. The shims and insulating layers are penetrated with tie members which traverse the insulating core and are fastened to the wire mesh shell within the front and back faces thereof. The outer casing may be formed of concrete comprising a mixture of concrete powder, haydyte gravel, styrofoam balls, fiber mesh particles, water and an adhesive agent. The top, bottom and side walls are formed in a tongue and groove arrangement in order to secure adjoining members to one another.

Abstract: A roller assembly is provided for imprinting a pattern in a malleable surface wherein a hub is formed with a cylindrical frame receives a pattern forming shell thereon. The shell is formed of a thin cylindrical tube having a smooth interior surface and a raised ridged pattern on its exterior surface corresponding to the desired pattern. The shell includes a separation crack or seam extending longitudinally along its perimeter parallel to the rotational axis of the shell, to allow the shell to expand and receive the cylindrical hub therein. Within the cylindrical shell and along opposite sides of the crack or seam, is formed a support which includes latches to close the crack. When locked, these latches cause the diameter of the shell to contract and fit snugly against the cylindrical frame of the hub. The roller further includes a shaft positioned in front of and extending across a face of the roller. This shaft supports a roll of ultra-thin plastic which is unrolled simultaneously with the roller.