Photographers reproduce mechanically and chemically what is in front of them. By means of a negative and digital techniques, photographs can be reproduced to infinity. Captivated by the idea and processes of reproduction, some artists have placed this concept at the very heart of their works. The exhibition LImage et son double / The Twofold Image (Centre Pompidou), and its accompanying book, develops dialogues between historical photographs and more contemporary works from the museums collections.