Calvin and Hobbes

While I wish he hadn’t quit, I can perfectly understand why he did it. He was very attached to his creation as art, not just as a money-making enterprise (which is proven by the fact that he steadfastly refused to sign any merchandising agreement), and he felt that he had taken it as far as it could go. He didn’t want Calvin and Hobbes to become stale, like so many other comic strips eventually do. Quitting when he did shows real artistic integrity.