Which way does the woman turn?
The description that came with the picture said that if you see her turn right, you're left brain dominant. If you see her turn left, you're right brain dominant.
Funny thing though, when I first looked at the image, I saw her swinging back and forth from left to right whilest facing forward, and it wasn't until after I focused a bit until I saw her spinning in circles, blinking now and then and she changes direction. So I'm not sure which part of my brain is dominant.