Photographer Emmet Gowin, who retired from the Princeton University faculty last month after 36 years teaching photography, trained and inspired many students, so it's fitting that some of their work forms a tribute to him in the current exhibit at the Princeton University Art Museum, "Emmet Gowin: A Collective Portrait."

There are kisses and there are kisses. That photographs can be kisses is not an obvious idea, but you could imagine a list of ways that could get long before it came to the type of kiss embodied in the life and work of Emmet Gowin, who is retiring from Princeton University after 36 years of teaching photography and is the subject of a retrospective show at the Princeton University Art Museum through February 21.