Through the works and thoughts of three protagonists of the Outsider art, Hans Prinzhorn (1886-1933), Jean Dubuffet (1901-1981), and Harald Szeemann (1933-2005), the catalogue attempts to portray the evolution of the perception of oeuvres that had no contact with the mainstream art world. The curator Carine Fol proposes a dynamic approach based on the dialogue between art and its limits, where discriminations and oppositions are overtaken by a universal message of art that at the same time respects multiple identities.