Motion Perception
Motion is perceived from the visual system. When it receives images of changing light in the retinal image, it infers motion - this is known as the phi phenomenon. The brain also infers motion based the assumption that shrinking objecting and retreating and enlarging objects are approaching. Lastly, the brain interprets motion from a rapid series of slighting varying images.
http://www.theguardian.com/tv-and-radio/tvandradioblog/2014/mar/05/the-simpsons-my-favourite-tv-show-stuart-heritage
Animation works on the basis that our brains infer motion when flashed a series of varying images in quick succession.
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