Optical illusion causes blades cutting vegetables at high speed to look like they're only slowly spinning

The wagon-wheel effect, here caused by videotaping a high-speed veggie-chopping machine, makes it look like the blade are only slowly moving, even as cucumber slices fly out at a scary-fast speed. This stroboscopic phenomenon is also commonly seen on footage of cars and airplane propellers, captured at odd intervals by the camera's shutter. — Read the rest

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