Heres one for starters.
If you take a look at the following picture, let me tell you ...
> it is not animated. Your eyes are making it move. To test this,
> stare at one spot for a couple seconds and everything will stop
> moving. Or look at the black center of any circle and it will
> stop moving. But move your eyes to the next black center
> and the previous pattern will seem to move after you take your
> eyes away from it.
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