Auction introduction: Featuring work by the Impressionist artists in Paris to the notorious Abstract Expressionist artists of the New York art scene, Christie’s 20th Century Evening Sale traces the radical nature of art from the 1880s to the 1980s. This season’s sale will present masterpieces from across the century, from works by modern artists, such as Henri Matisse, Marc Chagall and Fernand Léger, to European post-war titans, such as Gerhard Richter and Yves Klein. The sale also takes an in-depth look at the oeuvres of Pablo Picasso, David Hockney, Morris Louis and Georgia O’Keeffe, as well as the work of important female artists, including Lee Krasner, Joan Mitchell and Louise Bourgeois. Many of the highlights hail from the collections of prominent figures, such as Paul G. Allen and Jacques and Emy Cohenca.