Best Optical Illusion

I recommend you to download the image or to maximize the image somehow (you can do it just by clicking on the image) and to follow the instructions below. After that you don't have to do nothing just concentrate on the picture and see what happens. Instructions: If your eyes follow the movement of the rotating pink dot, you will only see one color, pink. If you stare at the black + in the center, the moving dot turns to green. Now, concentrate on the black + in the center of the picture. After a short period of time, all the pink dots will slowly disappear, and you will only see a green dot rotating if you're lucky! It's amazing how our brain works. There really is no green dot, and the pink ones really don't disappear. This should be proof enough, we don't always see what we think we see. Note: There is no trick in the picture, you eye is which fools you. :)