Is she spinning clockwise or counter-clockwise?
Is the foot she's spinning on her left or right foot?
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It is possible to see her spinning both ways, which do you see and can you see the opposite way as well?
This thing will drive you crazy once you figure out how to see both types of spin. It's crazy.
I know this is the GEEK answer, but the shadow/reflection of her extended foot only makes sense if she is spinning counter-clockwise. Until I noticed that, I could force myself, with some effort, to switch back and forth. Neat illusion. Nice figure, too.