Stare at the center for short time and you might find that this image starts to shimmer and move.
When you keep looking at the image, it seems to be moving before your eyes. That's because the lens of you eye is not perfectly round. You can't see all of the image sharp, and your eye is constantly making small movements. When you follow the outer rim, you will see that it is impossible. There is also an illusion of depth to this image, giving it a 3-d feel.
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