Since the 1950s Stefan Polónyi has realized a large number of buildings of all kinds from his Cologne office in Germany, working with famous architects all over the world. Architects who have worked with him see this ambitious claim as something that has enriched their own design process. He cooperated closely with Oswald Mathias Ungers on the Galleria for the Frankfurter Messe, he made the flying roof for Axel Schultes’ Kunstmuseum Bonn possible, and also the undulating metal ceiling in the auditorium of Rem Koolhaas’ Nederlands Dans Theater. Polónyi’s bridges, built from the 1990s in the Ruhr District, Germany have become landmarks in the meantime with their red curved tubes as a Living Bridges.