Look at the black + and what do you see
However if you stare at the black " +" in the center, the moving dots 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.
How You see the Illusion?
When you see the pink dot got around in the circle your blue and red cones are working in your eyes. When you stare at the + sign in the middle of the circle the red and blue cones freeze up. Then that leaves the only green cone working. That is why you see the green dot go around in the circle and not the pink dot
"25 Superb Optical Illusions For Kids." SloDive. N.p., 13 July 2011. Web. 16 Mar. 2015.
"Lots and Lots and Lots of Illusions." - Kids Pages. N.p., n.d. Web. 17 Mar. 2015.
"The Science of Optical Illusions." The Science of Optical Illusions. N.p., n.d. Web. 17 Mar. 2015.