 The expansion of informal logic to account for an ever broader range of argument is evident in discussions of the use of narratives within argument. In Plato’s Republic, Glaucon uses the mythical story of “The Ring of Gyges” to prove that humans are inherently selfish. In this and many other situations, stories of various kinds (accounts of some historical event, biographies, fables, parables, morality plays, etc) are designed to provide support for some conclusion. It is often been said that a novel or some other work of fiction is an argument for socialism, freedom of expression, or some other value. 