Perhaps the most permanent - and essential - character in Sally Mann's work is that of place: the American South. Her home of Lexington, VA is not just the set for her most powerful work; it is also the place where she met fellow artist and friend, Cy Twombly. The photographs from her new book, Remembered Light: Cy Twombly in Lexington, are featured in an exhibition at Gagosian Gallery; and she had many stories to tell when she sat down for a conversation NYPL's Paul Holdengräber.