Robin Evans discusses how mathematics changed between 1820 and 1890, stressing non-Euclidean geometry, and the work of Albert Einstein. Evans describes the Einstein Tower by Erich Mendelsohn, stressing the issue of metaphor in architecture design.
Evans discusses projective geometry, and the correlation between the gridding and fragmentation. He describes an installation by James Turrell, emphasizing how it appears two vibrate between two and three dimensions.