I've been teaching an artist friend of mine how to code. She's been loving it and recently has started to incorporate programming concepts into her other art. She's planning on doing a series of paintings that incorporate code snippets.

Here's an early example: http://i.imgur.com/itPcm.jpg

I showed her Quake III's Fast InvSqrt() (http://en.wikipedia.org/wiki/Fast_inverse_square_root#Overview_of_the_code). Do you have any other other interesting, important, historically significant, or just plain quirky code snippets?