Lorenz Attractor Crochet
In December 2004, two mathematicians from Bristol University constructed a crochet model of the Lorenz attractor, the canonical ‘chaotic’ system. They have offered a bottle of champagne to anyone who can match their achievement by following the pattern they published.

The bottle remains unclaimed.
[via infosthetics]
And, while we’re on the subject, I’d like to mention my favorite mathematical artist, Bathsheba Grossman.
Update 10/16/2005: Looks like there’s at least one professor who does this sort of thing on a regular basis.
