Manet's well-known painting in the National Gallery, London, of a caf -concert--a kind of cabaret performance that was the latest fashion in Paris of the 1870s--has a peculiar history. The painter initially planned an ambitious canvas with which he grew dissatisfied, then cut in two, one half being the painting in the National Gallery and the other half now in Winterthur in Switzerland. He repainted both fragments to make each a picture...