Illusion d'optique

Un petit quelque chose de comique :

If your eyes follow the movement of the rotating pink dot, you will only seeone color, pink.

If you stare at the the black + in the center, the moving dot turns togreen.

Now, concentrate on the black + in the center of the picture. After a shortperiod of time, all the pink dots will slowly disappear, and you will onlysee a green dot rotating.

It's amazing how our brain works. There really is no green dot, and the pinkones really don't disappear. This should be proof enough, we don't alwayssee what we think we see.