It may be true that artists adopt a flamboyant appearance, but it's also true that people who look funny get stuck with the arts.
Politics are not an instrument for effecting social change; they are the art of making the inevitable appear to be a matter of wise human choice.
I went out into the world when I was about 22. I wrote books and I illustrated books and did book covers, and I taught tap-dancing, and I was a model in the art school. I had no ability for any of those things, but what else could I do?
For an introvert his environment is himself and can never be subject to startling or unforeseen change.