Illusion of Movement
These images give the illusion of movement. The images of circular patterns appear to rotate while the images of square patterns tend to bend or warp. It all comes from the mind, trying to interpret what the eye sees. Each image can be enlarged by clicking on it.
For further explanation of why these illusions work and more great examples we highly recommend this site. http://www.ritsumei.ac.jp/~akitaoka/rotate-e.html
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