Do you see this girl spinning clockwise or counter-clockwise???
http://www.news.com.au/common/imaged...5687820,00.gif
If you see her spinning clockwise, you're a right brain person. Spinning counter-clockwise, left brain. If you can see both, your either forcing yourself to see it, or your brain cannot decide.
To help change directions of the spinning girl with your own perception, focus on the reflection of her foot or just her foot and imagine her spinning opposite, and it usually works within half a minute. It's harder to look at the whole picture and reverse the spin that way, because our eyes perceive what our minds are lead to believe. Spots that are missing (when you cannot see the arms/legs/ponytail from the side or different angle) are filled up with what we think it to be in our minds.
XI Wiki

