[Grey]

On another forum I read this was posted. Some people there say it spins counter-clockwise, and some could see it go both ways with effort.

I'm not really sure how well it measures which side of your brain is dominant though. There seems to be little to no correlation between the way you see it move, and your right / left-handedness for example.

Btw, I see it clockwise, but I'm right-handed, and very good at logic (on the LSAT which measure logical reasoning, analytical reasoning, etc. I scored in the top 99.9%.) And I don't think I'm particularly creative, although obviously that's much harder to measure.