The real world in which we live is accessible to us by a multitude of images or descriptions of the states; in this world, one plus one is two. Cicero was a great orator, Bucharest is the capital of Romania, Cinderella did not really exist, it was only a character of a fairy tale.
The concept of “possible worlds” has its origin in Leibnizian philosophy; this theory has also been valued in semantics (Kaarlo Ja¬akko Hintikka, Peter Frederik Strawson, Hilary Putnam at al.) as the universe of language discourse. A possible world is a general and abstract mental representation, a cultural concept. For example, Madame de la Fayette created both the novel The Princess of Cleves and the world where the Princess of Cleves evolves; Jean-Jacques Rousseau, in The Confessions, recreates the world of his time, by the evoking his own life as a framework to address human nature.