The fourth title in the TXT series, devoted to the various conceptions of the photographic picture and to the evolution of the medium, Pourquoi photographier brings a fresh look at photography and at its teaching. It gathers a selection of essays on the work of several photographers — among them Ansel Adams, Eugène Atget, Dorothea Lange, Nicholas Nixon, Susan Meiselas, Michael Schmidt and Judith Joy Ross — and on their respective publications, along with texts on what makes a person take up the practice at all.