We tried our best, but here are some errors we’ve found. We hope you won’t find more but of course you will. Please send them to us. Thanks!
| p. 82 | The signature of a basketball, asked for on page 69, was omitted from the answers. It is 2*2. (If you are surprised that this is not *222, you are hardly the first, but find an actual basketball and take a look!) | |
| p. 126 | In the text at lower right: Below we draw another way to visualize the crosscap. At below left in the figure, a Möbius band … middle. Above this, a disk has been arranged… |  |
| p. 140 | There are ten symmetry types that cannot be tie-dyed without cutting the fabric. The condition is incorrectly stated: the orbifold must be embeddable and there can be no cone points. | |
| p. 156 | The tiling at the bottom left of the page has symmetry type 32x only if the colors are ignored. In the technical language of Chapter 19 of The Symmetries of Things the uncolored tiling is absolute. However, as a colored tiling, it is relative and has type 3322. |  |
| p. 169 | In the illustration credits for page 9, we miswrote John Kostick’s name, correctly given in the answers on page 82. Our apologies to John! |  |
| p. 170 | We incorrectly credited Elsa Pandozi, who provided the images of the tetra-, octa-, and icosa- scopes on pages 77 and 78. Sorry Elsa! |  |