Real motion or the illusion of motion
I was contemplating some lights flashing in a circular pattern around a slot machine. The array of lights flashed in sequence up to the top of the machine, across, then back down the other side.
Thing is, the lights don't actually move. The don't do anything but blink. Each light blinks on for a period of time, then blinks off. So my question is this: Is that motion, or is it just the illusion of motion? And how does this relate to other types of motion?
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