![]() Bathroom tiles at the San Francisco Exploratorium, May 2000. (Notice the optical illusion!) |
![]() Pentagonal bathroom tiles made by Wlodzimierz Kuperberg, seen at the Kuperberg-Zieve's, Davis July 2000. |
![]() A design on Nicholas K. Zieve's shirt, July 2000. |
![]() Wall tiles in the Kyoto Kuramaguchi Subway Station, September 2001 |
The quotient orbifold for the group 22* is a disk with two order 2 corners and a reflecting boundary - that is, a plastic bag.