Photographer Stephan Kaluza walked the 50-kilometer route of the former Berlin wall—between Berlin-Schildow in the north and Berlin-Schönefeld in the south—taking photographs of the wall's absence, or “ghost" at one-meter intervals. Kaluza then assembled these 30, 000 pictures into a single seamless image, reproduced in this fascinating monograph. | Stephan Kaluza: The Invisible Wall, Hardcover | Indigo Chapters