Philosophers often use elaborate thought experiments in their writing. Are these anything more than rhetorical flourishes? Or do they reveal important aspects of the questions under discussion. Julian Baggini, editor of The Philosophers' Magazine and author of a book, The Pig That Wants To Be Eaten, which surveys some of the most interesting and imaginative thought experiments philosophers have used discusses this topic with Nigel Warburton. David Edmonds introduces the interview.