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The motion picture camera (see under camera) was developed from simple multi-image devices that, when spun or flipped, displayed the parts of a continuous movement, which, combined with the ocular principle of persistence of vision, produces the illusion of movement. The camera takes a series of photographs on negative film; when the positive is moved through a projector at a speed consistent with that of the camera, they throw a realistically perceived moving image on a wall or screen.
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