A Test for Right Brain, Left Brain Dominance?

Here is something interesting... a personal test for right-brain vs left-brain dominance. (Thanks to Rational Jenn for the link.)

Susan saw this first, showed it to me, and asked if I saw the woman as spinning clockwise or counter-clockwise. When I said clockwise, she said "What!!? No way!". According to this test, that means I am right-brain dominant. Susan saw it the other way, so that means she is left-brain dominant.

While I question some of the distinctions listed on that page (uses logic vs. uses feeling -- I use logic heavily!), there is some similarity between myself and what this page indicates are right-brain attributes. Most notably accurate for me I think are: big-picture oriented, present and future, philosophy and religion (obviously philosophy for me), spatial perception, presents possibilities. Some of the items in the left-brain functions list are definitely stronger in Susan than I, and overall the "left" list is more accurate of Susan and the "right" list is more accurate of me I would say -- so that is at least in line with the results of this test. But it isn't dead-on of course -- since Susan is a philosophy professor (right-brain list item), and I am considered very logical and am a writer both at work and for pleasure (both left-brain list items).