Wikipedia article
MathWorld article with rotatable images
Imaging maths - Inside the Klein bottle by Konrad Polthier
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Distortable image of Klein bottle and other surfaces
Message in a Klein Bottle
The Klein Bottle in Four-Space
Animations by Tom Banchoff, who has been making computer movies to illustrate geometric ideas since 1970.
The Klein Bottle by Tom Banchoff with Jeff Beall: movies and interactive versions
- Acme Klein Bottle. This is a company that sells glass Klein bottles.
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