The first one is interesting. The green spot going around is actually just where the pink spots are dissapearing momentarialy.
Hadn't seen that one before.
Seen the spinning wheels one, but it's still awesome.
This one is my favorite. Squares A and B are the same color. They look totally different, but try opening it up in Photoshop (or whatever graphics program you have) and moving one of the tiles onto the other one (or print out the picture and cut out pieces of the tiles). It's freaky.
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