Animation is a type of optical illusion. It involves the appearance of motion caused by displaying still images one after another. Often, animation is used for entertainment purposes. In addition to its use for entertainment, animation is considered a form of art. It is often displayed and celebrated in film festivals throughout the world. Also used for educational purposes, animation has a place in learning and instructional applications as well. When animation is used for films or movies, each frame is produced on an individual basis. Frames can be produced using computers or photographs of images that are either drawn or painted. Frames can also be generated by altering a model unit in small ways and using a special camera to take pictures of the results. No matter what method is used, the film or movie that results fools the eye into seeing continuous movement.

Persistence of vision is often projected as the reason the eyes can be fooled into seeing continuous movement that isn't really happening. Basically, the brain and the eyes cooperate, storing images for a mere fraction of a second. Minor jumps or blips are automatically smoothed out by the brain. Since animation frames are shot at very fast rates, most individuals see the movement without stoppages. Keep in mind that persistence of vision is a theory and not a proven concept. Many film academics and theorists accept its relevance to animation. However, there are some scientists that call the theory a complete myth.

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