Book excerpt: An intimate meditation on photography for the ages, curated around 120 epochal photographs. In On Photographs, curator and writer David Campany presents an exploration of photography in 120 photographs. Proceeding not by chronology or genre or photographer, Campany's eclectic selection unfolds according to its own logic. We see work by Henri Cartier-Bresson, William Eggleston, Helen Levitt, Garry Winogrand, Yves Louise Lawler, Andreas Gursky, and Rineke Dijkstra. There is fashion photography by William Klein, one of Vivian Maier's contact sheets, and a carefully staged scene by Gregory Crewdson, as well as images culled from magazines and advertisements. Each of the 120 photographs is accompanied by Campany's lucid and incisive commentary.