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The two lectures will be devoted to disconcerting images in Greek poetry, linked to sacrifice as a fundamental institution of the city. Their study will serve as a framework for the development of a general thesis on deviant metaphors. We suggest that these metaphors reveal social, political and religious aberrations. Since Aristotle, cognitive theories of metaphor have demonstrated that linguistic images help us to perceive phenomena on the basis of elements that "fit" or "understand" each other. Through a new reading of Greek tragedy, we'll uncover a typology of images that operates in quite the opposite way: these images are made up of elements that don't fit together at all, creating an alarming sense of the subversion of order.