The subject of the Poetics is poetry, including epic poetry, tragedy and comedy. Unlike Plato, Aristotle regards poetry as a techne. The practice of poetry is governed by rules; these rules can be formulated and taught. Poetry is rationally comprehensible. The rules for a genre of poetry can be derived from examination of individual examples of that genre, eg, tragedy. The aim is to see what, eg, tragedies, have in common. Aristotle agrees with Plato that epic poetry, tragedy and comedy are essentially mimetic. But he decisively rejects Plato's view that mimesis in art consists in copying from life.