The backward motion illusion occurs when the speed of rotation is such that-in the interval between each frame-a new blade moves nearly into the position occupied by a blade in the previous frame. Instead, the position of a moving object shifts with respect to the background in each successive still frame when viewed rapidly, one gets an impression of smooth motion. The individual pictures do not actually move. Film and TV actually consist of series of still photographs shown in rapid succession to fool the eye into seeing motion. This phenomenon is not common in direct vision, but often seen in movies and television. Smith is a technical writer at Boulder Laboratories of the National Institute of Standards and Technology.
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