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Whirling Watcher
When you view short bursts of moving images, you see some interesting effects. A series of slits moving rapidly past your eye allows you to see images in short bursts. Such rapid but fragmented views of moving objects can make the objects appear to jerk along, change speed, or even move backward. https://www.exploratorium.edu/snacks/whirling-watcher
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Animation basics: The art of timing and spacing – TED-Ed
Expert timing and spacing is what separates a slide show from a truly amazing animation. TED-Ed demonstrates, by manipulating various bouncing balls, how the smallest adjustments from frame to frame can make all the difference. https://www.youtube.com/watch?v=KRVhtMxQWRs
