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clipped from blog.ted.com

Filmmaker and animator David O'Reilly (who came up with the concept for iHologram) has noticed an interesting property in this animated GIF:

dor_grid_300x300.gif
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A large grid seen rotating at a certain speed will appear to group itself into smaller grids, spinning independently.

explaination

You are trying to capture a motion that is too fast for the framerate you’re using. In the case of a spinning wheel, what happens is that the wheel might turn, for example, 350 degrees between two frames but your eyes interpret it as -10 degrees. A similar thing happens with your grid. At the periphery, the lines move by more than one grid cell between two frames and the resulting visible motion is “snapped” to the smallest possible motion. The correct way to prevent such artifacts is to make sure that the shutter of the camera is open during the full interval between two frames, so that motion that is too fast gets blurred.

clipped from en.wikipedia.org
Temporal aliasing
If the flash is synchronized with the motion the element appears motionless
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