Kimberly Elam's Geometry of Design brings out the mathematical guns in analyzing and postulating about the inherent symmetrical nature of great design. She explores the relationships between visual representations and their foundations in geometry. It's a great book that focuses on the golden ratio and root rectangles. Elam utilizes overlays and grids in order to identify designs in different works of design and art. She looks at the underlying geometric structures in architecture, compositions and even furniture. The author has a great ability to distill these high level math concepts and distill them in an understandable and relatable way with insight into the design process.