Broadcast from his home in New York, American artist Philip-Lorca DiCorcia confesses how he hunted the subjects of his series Heads currently on display at Tate Modern in Exposed: Voyeurism, Surveillance and the Camera at Tate Modern until 3 October 2010. Part of a series of Exposed interviews available for free on your mobile phone at Tate Modern:http://bit.ly/bMTtrb