Quote:


I think our brain sees the light as a different object when it is on or off. While it is on, the light seems to move up on your 'screen', then it goes off ('dissapears') and goes on again: 'reapears' (if it would continue to move 'up' at that speed) at the position of the next light.




I guess, Excessus is right.
This means, it is the sort of optical illusion of
turning wheels in movies that ello mentioned*:
static pictures interupted by darkness
which are re-connected by the brain to get a continuous movement.
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*- the wheels which seemed to turn back while they turn fast forward -

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