La Hiéra, located at 10 rue de Paris in Saint-Rémy-lès-Chevreuse, is a large white building, witness to the time of the resorts, which was the refuge of two original personalities. First, René-Adolphe Schwaller de Lubicz, chemist, painter, alchemist then Egyptologist and theosophist, who left behind esoteric and philosophical works that are astonishing. Then Raymond Devos, multi-talented artist, clown, musician, poet, humorist, writer... This bourgeois house, former orangery, was their showcase outside the world, which this conference unveils.