Rotating Wheel Illusion
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At certain speeds, the wheel seems to rotate backward. This is caused by a stroboscopic effect in the display of a moving image.
Contributed by: Izidor Hafner (November 2016)
Open content licensed under CC BY-NC-SA
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"Rotating Wheel Illusion"
http://demonstrations.wolfram.com/RotatingWheelIllusion/
Wolfram Demonstrations Project
Published: November 29 2016