T-shirts with optical illusions? (or other cog-sci apparel?)

[fleaplus]

I've been trying to find some good t-shirts (or other apparel?) with optical illusions. Have you seen any good ones lately? I've listed some of what I've found so far down below

Comments

[fws]

not a shirt, but.... http://www.freshislefibers.com/Patterns/shadowknittinglinks.htm

[fleaplus]

ooh