Martin Gayford’s most recent book, with David Hockney, is 'A History of Pictures: From the Cave to the Computer Screen' (Thames & Hudson).

Self Portrait in Copenhagen
Peter Blake photographed at home in 2015.
Ash Dome (1977–ongoing), David Nash.
Wayne Thiebaud, photographed in front of Fields and Furrows (2002), in 2013. Photo: Sacramento State/Mary Weikert
Jim Dine photographed in his studio in Walla Walla, Washington, USA, in July 2014. Photo: Jason Teffry
Jannis Kounellis photographed at the Monnaie de Paris, March 2016.