Stephan Kaluza: The Invisible Wall

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.