David Mitchell's 'Cloud Atlas' burst onto the literary screen in 2004.  A novel comprised of six interconnected tales, each written in a unique style and told from a differing perspective, this genre-defying 'Russian doll' epic remains one of the most original, unusual and polarising works of recent times.  Shortlisted for the 2004 Booker Prize, in 2012 is was adapted for film with a stellar cast including Tom Hanks and Halle Berry. Mitchell has been nominated for the Booker Prize five times as well as winning the Sunday Times Award for Literary Excellence, given in recognition of a writer's entire body of work.  Twenty years after publication, Mitchell reflects on the past, present and future of his novel.  He speaks to journalist and director of the Booker Prize Foundation Gabby Wood.