This monographic publication dedicated to Magalí Herrera (1914-1992) reveals for the first time the large body of work by this Uruguayan-born artist and the many personal archives in the holdings of the "Collection de l'Art Brut". In 1967, Magalí Herrera began corresponding with Jean Dubuffet, who included her drawings in the holdings of the "Compagnie de l'Art Brut" in Paris. For several years, they maintained a letter-writing relationship in which Herrera invested herself intensely. For this reason, she entrusted her husband with the task of donating her drawings and personal archives to the "Collection de l'Art Brut" after her death. Text in English and French.