The larger built volumes are relatively simple reinforced concrete buildings with glass walls, but with a second outer skin of cladding carried on heavy steel framing, folded and stepped slightly to create angular undulating surfaces. The cladding is composed of 6 different materials, zinc, perforated zinc, glass, frosted glass, sandstone and no cladding, in a camouflage-like pattern, and created using pinwheel tiling. The 'crossbar' is an east–west built from that runs through the long gallery building, and is clad in perforated black steel panels.