Proportional Form

Hambidge's lesson course on root rectangles and the whirling square, the system he built around the golden section. Step by step, with the constructions drawn out.

Jay Hambidge

Hambidge measures Greek pottery and argues the shapes follow root-two and golden section rectangles. Whether or not you accept the conclusion, the analysis is careful and fully illustrated.

Jay Hambidge

Cook tracks the spiral through shells, horns, plants, staircases and Leonardo's notebooks. Over four hundred illustrations, and an unusually level-headed discussion of where the phi claims hold and where they do not.

Theodore Andrea Cook