Art Institute photography department head Matthew Witkovsky leaves the conceptualizing to the 57 conceptual artists featured in “Light Years: Conceptual Art and the Photograph, 1964-1977.” In his catalog essay, he categorizes the show as simply a “historical survey,” using 140-plus works to document a tangent in photographic practice that interested certain self-conscious artists in the 1960s and ’70s. (FULL ARTICLE: Bill Stamets, Chicago Reader)