The earliest recorded systems of genre in Western history can be traced back to Plato and Aristotle. Gérard Genette explains his interpretation of the history of genre in "The Architext". He described Plato as the creator of three imitational, mimetic genres distinguished by mode of imitation rather than content. These three imitational genres include dramatic dialogue, the drama; pure narrative, the dithyramb; and a mixture of the two, the epic. Plato excluded lyric poetry as a non-mimetic, imitational mode. Genette further discussed how Aristotle revised Plato's system by first eliminating the pure narrative as a viable mode. He then uses two additional criteria to distinguish the system. The first of the criteria is the object to be imitated, whether superior or inferior. The second criterion is the medium of presentation: words, gestures, or verse. Essentially, the three categories of mode, object, and medium can be visualized along an XYZ axis. Excluding the criteria of medium, Aristotle's system distinguished four types of classical genres: tragedy, epic, comedy, and parody.