"He is exacting," said show designer and art director Jonathan Park. Three little words that neatly embody the character of a perfectionist. It's a characteristic of Roger Waters that was referred to by everyone on the tour I interviewed. "OK, so it's another picky goddamn obsessive," I hear you say. Not so, I respond, for each one of those interviewees made the character observation without a hint of resentment or malice. Why?