On the Beautiful Minds blog, the latest entry is titled Is Psychosis a Prerequisite for Art? The author states his opinion that ” If the mental processes associated with psychosis were evaporated entirely from this world, art would suck. But so would a lot of other things that require imagination.” He then backs this idea up in a number of ways, including linking to a more detailed earlier article he wrote called Schizotypy, Flow, and the Artist’s Experience. This article goes into detail exploring how many processes we see going to extremes in psychosis can be highly valuable when utilized with a bit more control in people who are good at being creative.
Anyway, this all supports the thesis I have proposed before, that competent mental health treatment should not attempt to suppress everything that is on this “psychotic” dimension, but instead help people learn how to temper it so it is not overwhelming and destructive.