Some stationary patterns generate the illusory perception of motion. The illusory effect is usually stronger if you move your eyes around the figure. For instance, in this illusion, invented by the scientist Akiyoshi Kitaoka, the "snakes" appear to rotate. But nothing is really moving, other than your eyes! If you hold your gaze steady on one of the black dots on the center of each "snake," the motion will slow down or even stop. Because holding the eyes still stops the illusory motion, we speculate that eye movements are required to see it. Vision scientists have shown that illusory motion activates brain areas that are similar to those activated by real motion.
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