I got an email with these illusions in it... they are kind of fun... and kind of creepy... it's weird what the mind can do! You can click on each image to make it larger...
The following picture is not animated. Your eyes are making it move. To test this, stare at one spot for a couple seconds and everything will stop moving. Or look at the black center of each circle and it will stop moving. But move your eyes to the next black center and the previous will move after you take your eyes away from it.
Is the book looking towards you or away?
Is this possible?