optical delusion....

If you stare at the blinking pink dots, you will see only one color, pink.
If you look at the the + in the center, you'll see a circle of pink dots and a rotating green dot.

Now, stare at the + without moving your eyes.

                 
The pink dots will disappear and you will see only a rotating green dot.
It's amazing how our brain works. There really is no green dot and the pink ones don't really disappear.