KNITTING :: Dr. Daina Taimina and her Amazing Crocheted Hyperbolic Spaces.

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In 1997 Cornell University mathematician Daina Taimina finally worked out how to make a physical model of hyperbolic space that allows us to feel, and to tactilely explore, the properties of this unique geometry. The method she used was crochet. ...

A must read if you are into non-euclidean space and/or knitting:
http://www.theiff.org/oexhibits/oe1e.html