UPDATE: The question of whether this actually tells you whether you're left or right brained has come up (I wondered myself how legitimate of a brain test this could actually be), and a post right here on greengabbro.net offers a reasonable and well-written explanation as to why it likely does not, in fact, tell you much of anything about your personality or brain. There's also some links to some interesting auditory "illusions" that I found quite interesting. But still, regardless of the braininess of the image, please enjoy playing with the illusion below. It's true that it can be seen turning either way (it's an illusion). But it's also still very interesting that different people see it different ways on the first try, or more often than not the first several tries.

The Herald Sun, a newspaper in Australia, has a cool page up with an animated image that can tell you whether you are right- or left-brained. Here is the original page, with the details.

Look at the image below. Which way is the dancer model turning, clockwise or counterclockwise?

Most people see it turning counterclockwise, which is correlated to being left-brained. If you see it turning clockwise, you're right-brained. Can you make it change directions? for some it can be difficult to impossible. I can get it to change briefly if I really try (I see it turning counterclockwise).

Here's what they say it all means:

LEFT BRAIN FUNCTIONS
uses logic
detail oriented
facts rule
words and language
present and past
math and science
can comprehend
knowing
acknowledges
order/pattern perception
knows object name
reality based
forms strategies
practical
safe
RIGHT BRAIN FUNCTIONS
uses feeling
"big picture" oriented
imagination rules
symbols and images
present and future
philosophy & religion
can "get it" (i.e. meaning)
believes
appreciates
spatial perception
knows object function
fantasy based
presents possibilities
impetuous
risk taking

How's it look to you? What do you think?