 "Micro-Salon d'Avril" consisted of over 250 artworks, no larger than a postcard, by over a hundred artists.Besides Klein, the exhibit featured works from Pablo Picasso and Max Ernst, as well as Klein's parents.The exhibition gained the small one-room gallery considerable notoriety amongst the avant-garde of Paris, and the single-concept-driven approach would become a distinguishing characteristic of the Iris Clert Gallery.