Frei Otto, German architect and structural engineer turns 89 today. The 1972 Munich Olympic Stadium is perhaps his best known work. The pioneering tensile structure, which stood in considerable contrast to the strict, authoritarian stadium that was its predecessor, was meant to present a different, more compassionate face for Germany. Today, Frei Otto is still active in practice, working alongside architects such as Pritzker prize winner Shigeru Ban on the Japanese Pavilion at Expo 2000. Thanks for your contributions and Happy Birthday Mr. Otto!