Dror Bar-Natan's Image Gallery: Symmetry: Tilings:

The oo Group

Alan Weinstein's Table Mat
Alan Weinstein's table mat, Berkeley June 2000.
A tie at Fry's
A tie design at Fry's Electronics, June 2000.
A tie at Sears
A tie design at Sears, Roebuck and Co., June 2000.
Wallpaper at Shaneson-Szczepanski's
The guest room wallpaper at the Shaneson-Szczepanski's, June 2000.
Maya Bar-Hillel's tablecloth
Maya Bar-Hillel's tablecloth, Jerusalem December 2000.

An ACME Klein bottle

The quotient orbifold for the group oo is a Klein bottle. (This one courtesy of ACME Klean Bottle).