The Stepping-Feet Illusion. The two rectangles appear to be moving alternately, like a pair of stepping feet – but they’re not; they're moving together at the same constant speed. Don't believe me? Watch how the illusion disappears when the stripes fade to grey…pic.twitter.com/L9NqSq7vus
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Anstis, S. M. (2001) Footsteps and inchworms: Illusions show that contrast modulates motion salience. Perception 30: 785–794.
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