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I'm fairly certain the eye has a biological 'frame rate.' IE, our eyes (brains more accurately) still 'see' an image for a certain fraction of a second after actually seeing it. Maybe an eye doc can chime. To answer your other question, I too have seen a car drive by while I was on a sidewalk that appeared to have wheels spinning backwards. Actually I've seen this a ton of times, it's normal. No, they were not the ghetto spinner wheels.
I think I've noticed, when turning on an electric fan, as the blade accelerates, there is a subtle shift from a perception from backwards to forwards, before the spin rate is so high that it just a blur. But I'm going from memory, and I don't have such a fan to test it.
I made FF (13.0.1) full screen and then the image, nada, nothing changed....
Good question, I don't remember anyone ever saying they don't see it move. If recall correctly the effect is caused by your eye trying to focus in and out. This is old trick, perhaps the lack of movement might be explained by newer monitor/display capabilities. I'm using newer flatscreen and it still works for me so that is just a guess.
Instead of looking at one part of the image try panning from one side to the other.
It's just how your eyes interpret the incredibly rapidly changing light patterns. Sometimes at the right "frequencies" it will look like they are going backwards. It's a basic strobe effect.
Just fyi my post had nothing to do with watching a wheel on video. I said it's just easier to see the effect, which is why I posted it. The rest of the text explains what you see in person, like you asked about.
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