Banchoff's Klein Bottle
This Demonstration show's Banchoff's Klein bottle (or Klein cycloid), which is based on the Möbius band, a surface with only one edge.
The Banchoff Klein bottle has the parametric equations:
where the parameters , and are constants, and .
 C. A. Pickover, Mazes for the Mind: Computers and the Unexpected, New York: St. Martin's Press, 1992.