Its been well known throughout history that creative people tend to be, well, nuts, or at least it has always seemed there is a much greater incidence of nuthood amongst artists and other creatives than in the general population. There’s a good book called Touched with Fire that explores this very link.
Now Psychiatric Times confirms it with actual scientific research: creative people are indeed nuts, but mostly only a little nuts. See for example the chart below. See? Not psychotic at all. I’ll have to print this out and bring it to my shrink.