Note the double-cone at the Klein bottle's center:
Any Klein bottle in 3-dimensional space must pass through itself somewhere.
The Klein bottle comes in many topologically equivalent forms.
Möbius Bag: A Klein Bottle for Household Use
Contents of this page are ©1996 Nathaniel Hellerstein. Dr. Hellerstein can be reached through:
Meru Foundation, 524 San Anselmo Ave. #214, San Anselmo, CA 94960.
Email inquiries to: email@example.com