Photograph © Jack Berman/Moment/Getty Images; photograph © Susie Cushner/Taxi/Getty Images; photograph © Mondadori/Getty Images; Andy Warhol, Dollar Sign, c. 1981 © The Andy Warhol Foundation for the Visual Arts, Inc./DACS; Theaster Gates, Dorchester Projects, 2009 © White Cube, London, 2015; photograph © B. SCHMID/Amana Images/Getty Images; photograph © Evening Standard/Hulton Archive/Getty Images; Roy Lichtenstein, Washington Crossing the Delaware I, c. 1951 © The Estate of Roy Lichtenstein/DACS, 2015. Image courtesy of the Gagosian Gallery. Photograph: Robert McKeever; photograph © Ogilvy & Mather, all rights reserved; photograph © Jeffrey Coolidge/Stone/ Getty Images; Marina Abramović, Ulay, Breathing In/Breathing Out, 1977 © Marina Abramović, 2015. Courtesy of Marina Abramović and Sean Kelly Gallery, New York and DACS; photograph © Gilbert & George. All rights reserved, DACS, 2015. Photograph: Gilbert & George Studio; Peter Fischli/David Weiss, How to Work Better, 1991 © Peter Fischli and David Weiss, courtesy of Matthew Marks Gallery, New York; photograph © Godong/Robert Harding World Imagery/ Getty Images; photograph © Keystone-France/Gamma-Keystone/Getty Images; photograph © Gjon Mili/Masters/Getty Images; Pablo Picasso, from The Bull (La Taureau), 1945–1946 © Succession Picasso/DACS, London, 2015/Museum of Fine Arts, Boston/Museum of Modern Art, New York/Art Resource/Scala, Florence; photograph author’s own; photographs author’s own; photograph © Tim Robberts/Stone/Getty Images; Francisco Goya, from The Disasters of War, 1810–1820 © Image, The Metropolitan Museum of Art/Art Resource/Scala, Florence; Otto Dix, from Der Krieg, 1924 © 2015 DACS/The Metropolitan Museum of Art/Art Resource/Scala, Florence; Rembrandt van Rijn, The Night Watch, 1642 © Rijksmuseum, Amsterdam, 2015; photograph © Andy Crawford/Dorling Kindserley/Getty Images; photograph © KAMMERMAN/Gamma-Rapho/Getty Images; Banksy, Wall Art, 2005 © British Museum; photograph © Henrik Sorensen/The Image Bank/Getty Images; photograph © Tony Evans/Timelapse Library Ltd/ Hulton Archive/Getty Images; photograph © Eliot Elisofon/The LIFE Picture Collection/Getty Images; Bob and Roberta Smith, from All Schools Should Be Art Schools, 2013 © Bob and Roberta Smith, 2015; photograph © LWA/Larry Williams/Blend Images/Getty Images.
Bridget Riley, Man with a Red Turban (After van Eyck), 1946 © Bridget Riley, 2015. All rights reserved, courtesy of Karsten Shubert, London; Bridget Riley, Pink Landscape, 1960 © Bridget Riley, 2015. All rights reserved, courtesy of Karsten Shubert, London; Bridget Riley, Kiss, 1961 © Bridget Riley, 2015. All rights reserved, courtesy of Karsten Shubert, London; Michelangelo Merisi da Caravaggio, Self Portrait as the Sick Bacchus, 1593 © Image, Galleria Borghese, Rome/Scala, Florence; Caravaggio, The Supper at Emmaus, 1601 © The National Gallery, London. Presented by the Hon. George Vernon, 1839; Caravaggio, Salome with the Head of John the Baptist, 1607 © The National Gallery, London; Pablo Picasso, Dwarf Dancer, 1901 © Succession Picasso/DACS, London, 2015/Museo Picasso, Barcelona, Spain/The Bridgeman Art Library; Pablo Picasso, Seated Harlequin, 1901 © Succession icasso/DACS, London, 2015/The Metropolitan Museum of Art/Art Resource/Scala, Florence; Jacques-Louis David, The Death of Socrates, 1787 © Image, The Metropolitan Museum of Art, 2015/Art Resource/Scala, Florence; Piero della Francesca, Flagellation of Christ, 1458–1460 © Galleria Nazionale delle Marche, Urbino, Italy/The Bridgeman Art Library; Luc Tuymans, William Robertson, 2014 © courtesy David Zwirner, New York/London and Zeno X Gallery, Antwerp; Luc Tuymans, John Robison, 2014 © courtesy David Zwirner, New York/ London and Zeno X Gallery, Antwerp; Luc Tuymans, John Playfair, 2014 © courtesy David Zwirner, New York/London and Zeno X Gallery, Antwerp; Johannes Vermeer, Girl with a Pearl Earring, 1665 © Mauritshuis, The Hague; Peter Doig, Ski Jacket, 1994 © Peter Doig. All rights reserved, DACS, 2015/TATE Modern, London; Rembrandt van Rijn, Self Portrait, 1669 © The National Gallery, London; Kerry James Marshall, De Style, 1993 © Digital Image Museum Associates/Los Angeles County Museum of Art/Art Resource/Scala, Florence & Jack Shainman Gallery, New York, 2015.