Salaam,
The illusion comes from the apparent rotational movement from a static image made from 6 'slices' of the cog in 6 different positions. The only thing(s) actually moving, from left to right and back again, are the vertical black bars. The final Xtreme Flash animation is made from just two objects, the vertical blinds and the round looking blob thingy after the equals sign in the first post. The rainbow background isn't a necessary part of the 'illusion'. I just put it there for some added color.
For further detail I've attached the actual image of the 6 slices of cog I used. The spaces between the black bars are exactly equal to the width of one 'slice' of the image that appears to rotate, but in reality, doesn't.
I hope that's a better explanation,
HayTay
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