Photography is also unstoppably developmental, both at the level of the individual image and of medium. The photograph moves through time, in search of other "kin," some of which may be visual, but others of which may be literary, architectural, philosophical, or literary. Finally, photography develops with us, and in response to us. It assumes historically legible forms, but when we divest them of their saving power, as we always seem to do, it goes elsewhere.

The present volume focuses on the nineteenth century and some of its contemporary progeny. It begins with the camera obscura, which morphed into chemical photography and lives on in digital form, and ends with Walter Benjamin. Key figures discussed along the way include Nicéphore Niépce, Louis Daguerre, William Fox-Talbot, Jeff Wall, and Joan Fontcuberta.