Literary criticism is the study and interpretation of literature, often informed by literary theory. While criticism and theory are closely related, critics are not always theorists. Literary criticism functions to purge negative emotions from works according to Aristotle, while Plato believed works showing "bad mimesis" should be censored. Romantic theory views literature as an organic unity independent of author or context. Psychoanalytic theory applies Freudian concepts of id, ego and superego to literature. Mythological theory is based on Jung's idea of a collective unconscious expressed through myths. Deconstruction questions texts and reading practices by revealing hidden meanings and flaws. Marxist theory examines the political and economic underpinnings of literature. Feminist theory aims to