If your eyes follow the movement of the rotating Pink dot, the dots will remain only one color, pink.
However 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, all the pink dots will slowly disappear, and you will only see only a single green dot rotating.
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 ?
