Tzvetan Todorov introduced the idea that all narratives have a classic structure of beginning, middle, and end, with an initial state of equilibrium disrupted by conflict or problem, efforts to restore the equilibrium, and a return to a new equilibrium. Vladimir Propp identified 31 basic storylines that recur, while Roland Barthes explored how audiences experience both predictable "pleasure" and unexpected "jouissance" from narratives. Sigmund Freud's psychoanalytic theory analyzed narrative structures in terms of the id, ego, and superego, and Carol Clover described the "Final Girl" character type in slasher films.