We've had this emailed to us frequently, along with some other visual gems. I can't remember how long I took to find it the first time, but I do love it. I want to print it out and stick it up next to my coffee machine.
left brain-right brain - As a writer, I am very aware of this. Because I also edit, I have learnt to rapidly switch from one to the other. Because I was probably born a right hander but write with my left, I think this emphasises it. I do know that when my writing group does certain left-or-right-brain exercises, I tend to break all the rules.
Somewhere going around is a cute little graphic which can tell you whether you are left-brain dominant, or right-brain. It's a graphic of something which appears to be revolving, Depending on which way it seems to be turning (clockwise or anti-clockwise) is which side is dominant. I can make the darn thing switch direction!
Marg