suit a multitude of existing interior courtyards, train stations, and new construction projects: Hippo House of the Berlin Zoo, Germany, German Historic Museum in Berlin, DZ Bank Berlin, Cybele Palace in Madrid and Exhibition Centre Milan. Cable net facades For a facade of nearly seamless transparency, parallel cable assemblies span horizontally and vertically in between the sides of the building volumes as well as in between the roof girders and floor of the Kempinski Hotel at the Munich airport. The cable net facade is comparable to a tennis racket. Depending on the degree of pre-tensioning and arrangement of the cable assemblies, a multitude of variations of this structural principle are possible and have been realized: the roof over the Roman Baths in Badenweiler, Germany; CYTS Peking; Main Train Station in Berlin, Germany; Foreign Relations Office in Berlin, Germany; and the Time Warner Center at Columbus Circle in New York City. Cable net roofs The cable net roof is the transformation of the primarily single-plane loading of the spoked wheel to vertical load transfer. It combines the characteristics of cable and membrane structures: in between closed, self-anchored tension and compression rings exists a wide-meshed primary load-bearing structure of cables with a secondary membrane structure tensioned in between. One of the first modern cable net roofs is the Mercedes-Benz Arena in Stuttgart. Further examples of this principle are some of the many soccer stadiums worldwide (such as in Berlin, Frankfurt am Main, Cologne, Warsaw, Kapstadt, Durban, Port Elizabeth, and Johannesburg). Membrane roofs Most of the cable net roofs are clad with a textile membrane. Textiles allow for lightweight, transparent roofs and facades that fascinate through their variegated and unusual forms. Due to their negligible weight and inherent foldability, textiles are predestined for convertible roofs. One of the first permanently moveable membrane roofs was the one across the bullfighting arena in Saragossa, Spain, which can be closed and opened like a flower within minutes. This same principle was also applied to the "largest cabriolet of the world," the roof across the Commerzbank Arena in Frankfurt. The only things lighter are structures made of air: the pneumatic pillows of the Arenas Nîmes and Madrid change seasonally within a couple of days or, depending on the weather, within a few minutes. For the new roof over BC Place in Vancouver the principle of foldable membrane roofs was adapted for the first time with pneumatic pillows,