User : pgreenwood
- Created: 2866 days ago
- Karma: 388
- "The Symmetries of Things"  by John H. Conway, Heidi Burgiel, and Chaim Goodman-Strauss.
A fantastic and beautifully illustrated expository work describing symmetry groups such as the 17 wallpaper groups in the plane (think Escher), and other tiling groups in for example the hyperbolic plane. Love the use of orbifold notation as opposed to crystallographic notation.