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Originally Posted by NEOWatcher
2) Your eye is trying to focus on a portion of the wheel, but since it is moving, it is drawing your eye around with it. The constant "rebounding" of the eye back to the first spot may have some effect.
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I like this idea, that's where my money is. There's a natural frequency at which your eye moves back to the original location as you watch a propeller. I would think that persistence of vision would be a gradual rather than sudden fading, so it would be harder to pick out a specific frequency, but maybe that could work too.