This book could not have been written without the assistance of the artists and photographers whose work is discussed here. Heartfelt thanks in particular to Zach Blas, Julian Charrière, John Gerrard, Magdalena Jetelová, Line Kallmayer, Simon Norfolk, Trevor Paglen, Melanie Pullen, Sophie Ristelhueber, Kathryn Smith and Jane and Louise Wilson. Their generosity, and the discoveries that came to light through conversation, have been one of the great pleasures of this book. Thanks too to Jamie Marshall at Simon Norfolk Studio; Daniel Neves, Director, Paglen Studio GmbH; Fenna Ackerstaff at Studio Julian Charrière; Tom Dingle and Georgia Spickett-Jones at Thomas Dane Gallery; Cristina D’Alessandro at Scala and Louis Jaquet at DACS.