At first this one may be hard to see, but if you begin to scan back and forth across the image you will notice that the squares in your periphery begin to rotate. As soon as your eyes stop moving, however, rotation will cease.
No, this is not an animated GIF. The image really is static. Notice that when you look at any individual point dead on, it will stop moving. This powerful illusion is derived from interacting color contrasts and shape positions within the image.
Also known as the pac-man illusion, if you stare at the center cross for a couple seconds you will begin to perceive a green disco going around the circle of magenta discs. After a few more seconds the magenta discs will gradually begin to fade away until all you see a green disc going in a circle around the cross (if you’re having trouble seeing it move closer to the screen).
Another famous illusion, this one was recently rediscovered in a cafe wall at the bottom of St. Michael’s Hill. Although the lines appear to be diverging from one another they are in fact quite parallel.
Probably one of the most unbelievable illusions out there, this one was first published by Edward Adelson, a professor at MIT. Although the square labeled “A” appears to be darker than the square labeled “B”, they are actually exactly the same shade of gray. Its okay if you don’t believe it, we didn’t either, but Photoshop proved us wrong.