The phi phenomenon demonstrates that illusions can be influenced by perceptions of movement.
An illusion of movement known as the "phi effect" develops when stationary objects—such as light bulbs—are positioned side by side and rapidly lighted one after the other. On theatre marquees, the technique is widely employed to simulate moving lights.
It looked like the still pictures were moving as you quickly turned the pages. This optical illusion is a good illustration of the phi phenomenon, which is a psychological name for the optical illusion of perceiving a sequence of motionless images as moving.
Because of his research on circular motion, where the angle phi parameterized the step size, Max Wertheimer (1912) gave it the name "phi." Every aspect of film and television technology is based on the phi phenomenon.
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