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After playing with this a good bit, here's my favorite:

http://demoseen.com/langton/#@@1o..+..-1o..+..-<>..$.^

It makes a cloth/napkin, and then slowly absorbs blood from the four corners.

That's really, really cool. I want to make a gallery system for these, where people can submit theirs and others can modify from there. Btw, I just added a polar mode (the grid is treated as polar coordinates, and converted from there); the & instruction switches to polar and _ brings it back to cartesian, so you can actually blend the two. http://demoseen.com/langton/#&m.$!~PFP!!..

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