This prototype produced an undulating geometry using curvilinear molds. This was the only mockup in which the molds did not use plywood frames. Instead, the molds were 3D printed and temporarily locked together with small clamps. A total of three curves were used, each corresponding to segments of circles of 4, 6 and 12 inches in diameter. The reinforcing was made using 1/4 inch (6 mm) steel rods that were placed 2 inches (5 cm) apart following the trajectory of the proposed geometry. The wall offered an overall undulating configuration generated by waved bands laid out adjacent to each other. Thus, some voids emerged between bands. An intrinsic characteristic of the system is the possibility of incorporating openings on the wall resulting in variable views depending on the size, position and angle of the viewer with respect to the void.