The artist David Hockney grew up in the rainy, industrial city of Bradford in northern England. But his most well known work is filled with Southern California light and color – a painting of a pool in the Hollywood Hills or a photo montage of the Pearblossom Highway. A new documentary about the artist explores how those two places inform his work and his outlook, and how he’s still going strong at 78. We’ll speak with the director of “Hockney”, Randall Wright.