A fascinating exploration of Einstein's theory of relativity told by narrator, actor Peter Ustinov, and a cadre of preeminent scientists. Produced on the centennial of Einstein’s birth in 1979 by WGBH and BBC, based on Nigel Calder’s titular book. The film takes place at the University of Texas’ McDonald Observatory where a staff of renowned scientists and physicists take both Ustinov and the viewer through a hands-on experience of the various facets of Einstein’s theory.