In 1974, Ken Ohara moved from Tokyo to New York and began a strange new experiment. He bought cameras with pre-loaded films, opened a local phone book, and started to mail them to random households. He attached instructions: photograph yourself, your family, your friends; then return the camera with the name and address of the person it should be mailed to next. These “chain” cameras would travel to 36 states, including Hawaii, and to 100 people. Now the contact sheets—or the “photography of possibility,” as Ohara puts it—are going on view. They document a fraught time in American history, when hippy culture was fading, gay rights were rising, and the Vietnam War was nearing its end. —Elena Clavarino