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Comedy is one of the original four genres of literature as defined by the philosopher Aristotle in his work called Poetics. The other three genres are Tragedy, Epic, and Lyric. Literature in general is defined by Aristotle as a mimesis, or imitation of, life. Comedy is the third form of literature, being the most divorced from a true mimesis. Tragedy is the truest mimesis, followed by epic, comedy and lyric. The genre of comedy is defined by a certain pattern according to Aristotle's definition. All comedies begin with a low, typically with an "ugly" guy who can't do anything right. By the end of the story or play, the "ugly" guy has won the "pretty" girl, or whatever it was he was aiming for at the beginning. Comedies also have elements of the supernatural, typically magic and for the ancient Greeks the gods. Comedy includes the unrealistic in order to portray the realistic. For the Greeks, all comedies ended happily which is opposite of tragedy, which ends sadly. The oldest Greek comedy is Homer's Odyssey, the story of Odysseus and his crew's attempt to return home after the fall of Troy.