When I saw it here.. I could only get her to spin anti-clockwise.. didn't matter how I looked at it, I couldn't get her to change direction.
When I looked here though... I can get her to go clockwise, as long as I look at the left picture. The minute I look at the right one she changes direction.
My brain knows it's left from it's right, even though I have to check occasionally by pretending to write with my right hand when someone asks me for directions (am I the only person who does that?)