Roy Lichtenstein's comic-inspired canvas 'Whaam!' disrupted the art world in the mid-1960s, delivering an enigmatic salvo at both the conventions of artistic expression and the post-war representation of conflict. Celebrating art’s unique power to promote understanding and progress across cultures, we've partnered with Citi Private Bank to present 5 episodes from our 'The Most Famous Artworks in the World' series: http://bit.ly/2OAdwvo | Sotheby's