Photo: Christie's Images Ltd 2010 Contemporary Prints Highlights in this section of the sale include works by some of the crucial artistic personalities of the second half of the 20th century such as Andy Warhol, Cy Twombly, Bruce Nauman, Roy Lichtenstein, Tom Wesselmann and David Hockney, as well as a work by a more recent star of the contemporary art world, Turner-prize winner Grayson Perry.