Given their long relationship, it is no surprise to find the spirit of Marcel Duchamp alive within Reynolds' body of work. Grey cards imprinted "De ou par Marcel Duchamp ou Rrose Sélavy," designed for the inner lid of his Boite-en-valise, are repurposed as onlays in Reynolds' binding for Rrose Sélavy. Proof prints of Duchamp's Corolles "rotorelief," later used as the cover for the Surrealist periodical Minotaur (no.6, Winter 1935), are incorporated as endpapers, adding surprise and whimsy to seemingly ordinary bindings. Perhaps their most successful and beloved collaboration is the binding for Alfred Jarry's Ubu Roi (King Ubu) designed by Duchamp and bound by Reynolds -- when opened, the binding spells his name; a gold crown visible through the front cover further heralds the puppet king.
- Ubu Roi: Drame en Cinq Actes (King Ubu: Play in Five Acts) by Alfred Jarry. Paris: Librarie Charpentier et Fasquele, 1921.
- Rrose Sélavy (par/by) Marcel Duchamp. Paris: G.L.M., 1939.
- Night-flight by Antoine de Saint-Exupéry; translated by Stuart Gilbert. Paris: Crosby Continental Editions, 1932.
- Loin de Rueil (Far from Rueil) by Raymond Queneau. Paris: Librarie Gallimard, 1944.
- 12 Rotoreliefs by Marcel Duchamp.