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Originally Posted by Ken G
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.
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I think this is a wonderful hypothesis, and my initial feeling was that it's true. There's one doubt I have, though. The sample may be too small, but I turned on a fan in my office and asked fellow workers whether they saw the same effect. And they all did. But the thing I wonder is, if the effect is a natural speed at which the eye moves, wouldn't that speed vary from person to person, depending on their age or muscle strength, for example? Why would all humans move their eyes at the same speed? Maybe they do, and there's some reason for it. But I would recommend that other people try spinning something until you see it go backwards, and then ask people around you whether they see the effect at the same speed or not.