The one you're not looking at turns clockwise

Look at either the red dot or the yellow dot.  The circles near that dot will turn counterclockwise.  The others turn clockwise!

Or: let your eyes bounce back and forth between the two.

Or: look away from both of them.

Puzzle  1: how does it work?

Puzzle 2: who first made this gif?  I can't find the original source.

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