The Magic of Vision

If your eyes follow the pink spot to move, you only can see one color : Pink. If you focus on the middle "+" sign, the moving spot will be green color. If you continue to focus on the middle "+" sign, after a while, all the pink spots will gradually disappear, you will only see the "Green Spot" moving.



This is how your brain works. Actually, there isn't any green spot in the picture. and the pink spot isn't disappear.understand the concept behind?