Video: Louis Kahn Lecture, 1972. The clip begins with a four minute title sequence, accompanied by Louis I. Kahn’s voice. Kahn’s live lecture begins at 04:16. Kahn defines architecture in terms of beauty, wonder, and expression. He describes material as a manifestation of spent light and argues that there is no such thing as architecture, but only the spirit of architecture. He discusses his work on the Salk Institute and his collaboration with Jonas Salk and Luis Barragán.