What inspired Mac Low's light chart

Anne McElvoy is joined by the Booker Prize-winning writer Julian Barnes to discuss the painters he admires, and his new collection of essays on 19th and 20th century artists. The Pakistani novelist and women's rights activist Bapsi Sidhwa talks about her 1978 novel The Crow Eaters, which is about to be re-published. And Anne discusses poetry inspired by light, and in particular the work of Jackson Mac Low with James Wilkes and Greg Lynall.