This “rotating figure of a woman”:http://www.news.com.au/perthnow/story/0,21598,22492511-5005375,00.html is a fantastic optical illusion that has been making the rounds recently. The trick to changing the direction of rotation (at least for me), is to focus on the pivot foot (the one that stays still relative to the middle). The point at which the foot is hidden behind the leg is when you can attempt the mental switch to rotate in either clockwise or counter-clockwise direction.
I am somewhat dubious to the idea that any particular brain hemisphere is responsible for the rotational attitude however. The description, or lack thereof, sounds plausible enough, but seems just too pat.
