NEW YORK - What a week! In four successive auctions devoted to art from the Impressionist era through today, $484 million worth sold at Sotheby’s New York. A total of 500 lots found buyers, making the average sale price close to $1 million. The week culminated in the Contemporary Art Evening Auction, which attracted bidders from 34 countries and saw the highest sell-through rate of this decade. Click through to see the 20 sensational works – from Monet to Warhol – that achieved the highest prices.