Satire and irony in some cases have been regarded as the most effective source to understand a society, the oldest form of social study. They provide the keenest insights into a group's collective psyche, reveal its deepest values and tastes, and the society's structures of power. Some authors have regarded satire as superior to non-comic and non-artistic disciplines like history or anthropology. In a prominent example from ancient Greece, philosopher Plato, when asked by a friend for a book to understand Athenian society, referred him to the plays of Aristophanes.