Rana Mitter discusses the allure of the missing work of art with the writer Rick Gekoski. Are some works of art more interesting in their absence? New Generation thinkers Corin Throsby and Laurence Scott propose the idea that crowd-funding and social media are changing the relationship of artists and their audiences. Rana talks to the playwright Tanika Gupta about her new play for the RSC, The Empress, opening at the Swan in Stratford. And Ian Macmillan and Julia Jordan discuss the films of the experimental writer BC Johnson who would have been eighty this year.