National audience The romanciers invent languages, but philosophers, anthropologists and linguists also invent fictions when they reflect on the origin of languages. For example, Condillac offers a fiction to try to gain a more philosophical than wonderful truth and explain the birth of language. It “assumes two children in the need to imagine up to the first signs of language” 1• Some authors after him did not just imagine two characters for the beginning of history, but built from this search for the origins of a whole society, from the language of the origins. The source of these companies is the belief that language reflects the society that speaks it. There is also an exion on what a perfect language is and what is a disguised language in its report in the sense and in its use: any questions that may have fed the authors who invented a language that would mimic the world in which he would speak and which he would speak from Swift to Orwell and to the author of science-fi Ursula le Guin. Among these archaeologists of the language of origin, the Court of Gebelin 2, which was sometimes classified as ‘literary fous’, had a huge celebrity thanks to the promise he had made to his contemporaries (imprudently, since the project was not carried out): providing them with the key to old times through a dictionary of the original language and allowing them to stop the course of history and finally rebuild the haven on land. This is a somewhat curious case that we will see here: not a language that is insold as part of a utopia, but a utopia that becomes apparent in language work.