Everybody has a different persistence of vision and 'eye tricks' this is when an object could be motionless could suddenly be moving really fast just at a turn of your head. This often occurs in a lot optical illusions where the image could be still but the circle is drawn in such a way it looks like its moving.
Well in the animation world we have a device called a zoetrope and looks like the one at the bottom of this page. This would basically have an animation reel inside covering the circle interior and small slits cut out of the outside box and when the user spins the box and little slots would trick your eyes into thinking the animation is moving
The modern zoetrope as we know of was invented around the 18th century by a British mathematician called William G Horner, he called it the deadalum, but it was more commonly known as the 'wheel of the devil'. The zoetrope didn't become popular until the 1860's when it was patented by British and American makers. An American developer developer names the device the zoetrope in which it is known known as today as the 'wheel of life'
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| Deadalum (zoetrope) |
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