I have no idea where it comes from. The thing that I do know is that after a while, you begin to realize, A) how little you know about everything and, B) how vast the brain is and how it encompasses everything you can imagine — but, more than that, everything you can’t imagine. What is perhaps central to this is the impulse to make things, which seems to me to be a primary characteristic of human beings — the desire to make things, whatever they turn out to be. And then, supplementary to that, is the desire to create beauty — which is a different but analogous activity. So, the urge to make things is probably a survival device; the urge to create beauty is something else — but only apparently something else, because, as we know, there are no unrelated events in human experience.