The brain perceives continuous movement in a rapid series of slightly varying images (stoboscopic movement), and the motion is constructed in our heads. Another illusion of movement is created by the phi phenomenon. This is when two or more stationary lights blink on and off in succession, and we perceive the light to be moving from one point to the next. An example is the loading symbol. It appears to be moving in a circle but the small rectangles are lighting up one right after another.
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