Jacques Spacagna (1936 Paris, France – 1990 Paris) was a prominent figure in Lettrism. A poet and a painter, he created works that are distinctive for the use of micro-signs combined in hypergraphical hallucinogenic paintings. Spacagna’s works are distinguished by the hypergraphical use of letters, alphabets, signs, and numbers, heralding what would be later referred to as Infinitesimal Art. In 1959, Henri Chopin published Spacagna’s poetry in the French literary magazine Cinquieme Saison, the precursor of OU. During the following years, the works of Spacagna were displayed in several galleries and museums in Paris. His first recital of Lettrist poems took place at the Musée d’art moderne de la Ville de Paris, along with fellow members of the Lettrist movement. After he parted ways with the Lettrist group in 1972, Spacagna’s work began to take on a more figurative quality. A collaborative relationship between Francesco Conz and Spacagna is presented in the book Jaques Spacagna – Le Voyage en Italie, by Frédéric Acquaviva, published by Archivio Conz in 2007. The book traces the milestones of the projects completed by Spacagna during his stay in Verona in 1989 and 1990. Spacagna took part in the sixth workshop for the project La Livre: An Homage to Ezra Pound at Brunnenburg Castle and created numerous editions and unique works for Conz, including the prepared piano "Piano dit des arcs-en-ciel d’Erik Satié (1989)".