Auction introduction: Sotheby’s London’s forthcoming Prints & Multiples auction will present editioned works from the early 20th century through to today, showcasing outstanding graphic works by international artists including Pablo Picasso, Henri Matisse, Andy Warhol, Roy Lichtenstein, David Hockney and Gerhard Richter. Open for bidding from 18–25 March, the spring auction will feature a broad and dynamic selection of prints spanning movements from Post-Impressionism to Pop.