Watch HDToday. A film about the pioneering community-building project of the world-famous architect Frei Otto in Berlin, called the Okohaus-an experimental, ecological, customized housing project in the city center. Including interviews with Frei Otto, Christine Kanstinger-Otto, Hermann Kendel, Yona Friedman, Anne Lacaton and Jean-Philippe Vassal, and other involved architects, planners, and inhabitants, the film shows the development and the philosophy of the project, which was built for the International Building Exhibition in Berlin 1987 (IBA).