[Someone]

For knitting, I expected links to https://www.americanscientist.org/article/adventures-in-math..., http://scientificamerican.com/article/the-stunning-symbiosis..., or http://www.toroidalsnark.net/mathknit.html

[jcl]

Reminds me of crocheted hyperbolic surfaces, which make it easier to visualize some less-intuitive properties of hyperbolic geodesics:

http://www.theiff.org/oexhibits/oe1e.html