Roger Horrocks was Len Lye’s assistant in New York during 1980, the last year of the expatriate New Zealand artist and filmmaker’s life. He is the author ofArt That Moves: The Work of Len Lye and has also curated exhibitions of Lye’s work, directed an award-winning film about him, and written the libretto forLen Lye: The Opera. Len Lye worked in many areas, including painting, sculpture, film, photography, and poetry. Today his artworks and films are held in major museums such as the Museum of Modern Art in New York, the Art Institute of Chicago, the Whitney Museum of American Art, and Paris’s Centre Pompidou, and in film archives around the world.