William Kentridge describes the "uncertainty and imprecision" in his process, while working on video animation for I am not me, the horse is not mine (2008) in his Johannesburg studio.

Excerpted from William Kentridge: Anything Is Possible, a new hour-long film from the producers of the Peabody-Award winning Art in the Twenty-First Century television series. The film gives viewers an intimate look into the mind and creative process of William Kentridge, the South African artist whose acclaimed work has made him one of the most dynamic and exciting contemporary artists working today.

William Kentridge: Anything Is Possible premieres October 21, 2010 at 10:00 p.m. ET on PBS (check local listings).

For more information, visit: art21.org/anythingispossible