Not long ago I visited a magnificent art museum near my home. It exhibits many masterpieces including some by Titian, Rubens, Monet, Winslow Homer and Edward Hopper. While strolling through the galleries, I stopped occasionally to watch someone sketching in front of a painting or statue. I didn’t ask, but my short and ancient experience as an art student made me suspect that they were students too. It is a long and honored tradition for artists to learn by imitating the masters.