International audienceThis article looks at the way in which several romantic poets take the materiality of letters into account: the quality of their quills, the legibility of their handwriting, and above all the weight of their letters at a time when the addressee was responsible for the postage. For a group of poets whose art tries to free itself from the materiality of life and to reach a form of transcendence, the material dimension of letters is often considered as a limit, an obstacle to suffer. Only one poet really stands out among his contemporaries: John Keats creatively plays with these limits and turns them into poetic material; he even offers a distinction between various shapes of letters, oval, round or square.Cet article s’i...