It's Friday, time for some fun:

http://www.ritsumei.ac.jp/~akitaoka/index-j.html

Check out those crazy optical illusions. Inparticular the 2nd and 4th images ripple and rotate respectively when you move your head from side to side or forward and back whilst staring at the centre of the pictures.

The picture down the bottom with "Akiyoshi's Illusion" written on it is most peculiar, the "beads" swim about like crazy no matter how hard you stare at them.

Great stuff.