Has anyone seen this picture yet? I've seen it several times now, and the word is that you can mentally switch the "spin" of the dancer through willpower. But then I've also read where it's a trick and it's programmed to switch.
So which direction, clockwise or counterclockwise (looking down from the top) does this thing spin for you? And can you switch it?
I've been able to make it switch directions by looking at the shadow, but not always. Sometimes I have trouble.
EDIT - maybe it has something to do with the color of the background? I can "switch" it just fine here at the Cafe.