If you are in or can get to New York, you really do have to see the Matisse Picasso show at MoMA. It's spectacular (wonderful works from two great artists) and witty (clever, provocative pairings). Who cares if the premise -- that each artist was constantly comparing himself to and competing against the other -- is flawed? It's pretty convincing for at least some stages of their careers. And every artist needs rivals he/she can respect.