But another kind of teacher, the artist, shows us how to see, and some of the most interesting are those who model growth of consciousness over time, using developing craft to expand ambition. These career arcs offer much pleasure and instruction, especially when combined with letters, memoirs, interviews, and secondary sources. In literature, Joyce’s arc grew toward unintelligibility, as did Henry James’s, in a different way. Twain’s arc grew from high jinks through moral profundity and into prescient bitterness. In painting, J.M.W. Turner and Picasso come to mind.