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I imagine that the point is that there really are no cues that she's spinning clockwise other than that her hand and leg are in a leeward direction. There's no reason she couldn't be spinning against the grain. That said, I cannot even force my brain to see her spinning any way other than clockwise.


That's the idea - there is no "correct" direction, but the way the body is posed leads the brain to think it is rotating clockwise. However staring at it seems to reset something, and it slows and then flips somehow, it's quite impressive. If you are having trouble getting it to do it automatically try staring at it and blank your mind for a couple of minutes, don't try and follow it.