Harvard professor David Fixler talks about the challenges he faced renovating Louis Kahn's iconic laboratory building. Richard Labs is one of the most iconic buildings of Modern Architecture, and transformative in Louis Kahn's architecture. Kahn treated the scientists as artists separating the functional spaces into 'served' studios and 'servant', allowing natural light to penetrate into the laboratories which were arranged into a group of five towers. He explored many of the technical constraints of the program and carefully detailed the exposed prestressed concrete structure and mechanical systems which had not really been done before.