addendum

Oh, actually the best part of "Believing is Seeing" is when the author reminded us that Picasso managed to work in several different styles, and in every medium he could get his hands on, for most of his life. This, to me, is the sign of a truly successful artist- when they feel like making plates with paintings of goats on them, they do. When they feel like sticking bike seats and handlebars on the wall to make a head with horns, they do. When they want to make an image about peace, or sex, or the carnage of war, they do. Nobody constrained Picasso, no one told him he could only make they same kind of work every day. That's the goal.