HOW do you attribute value to a piece of art?Under the auctioneer's hammer earlier this month Pissarro's impressionist work Boulevard Montmartre, Matinee De Printemps almost scaled the dizzy heights of £20 million. A steal.The painting belonged to Jewish industrialist Max Silberberg, who was forced to break up his collection by the Nazis.Many other artworks from around Europe, plundered by Hitler's troops in the late 1930s and early 1940s, might have been lost forever were it not for the...
