Illusion Circle

In this image we can see a circle made from violet little circles that appears and dissapears after a while.

Now if you want to see how this realy works, concentrate on the sign from the center of this image.After a while you'll see that the image changes to GREEN ! If you'll continue to look in the center the circle will disappear.( tell me what you think about that - post a comment )

If you want to see this effect first click on that image !

Another Ilusion that will freak you out !