Stepping Feet Illusion
In the video below, two colored bars (feet) move horizontally across the screen. One is red and the other is blue. Stare at the area marked “Look Here” and watch what happens as the bars move across the two different backgrounds. As they travel across a background that is striped, they appear to be out of sync with one another as if they are moving in a “stepping” motion. When the background changes to a solid color, however, their true movement is revealed. Each of the bars is moving at the same pace throughout the entire video.
This illusion was first described by Stuart Anstis from the University of California, San Diego.
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