This  is another example of an amazing illusion!!!  (*_*)  The last  sentence is so true.
 
  If your eyes  follow the movement of the rotating pink dot, you will only see 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 a 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.