 Merleau-Ponty’s friend and former student Claude Lefort published two of his teacher’s unfinished manuscripts posthumously: La prose du monde [The Prose of the World, 1969/1973], an exploration of literature and expression drafted in 1950–51 and apparently abandoned; and Le visible et l’invisible [The Visible and the Invisible, 1968 V&amp;I], a manuscript and numerous working notes from 1959–1961 that present elements of Merleau-Ponty’s mature ontology. The latter manuscript was apparently part of a larger project, Être et Monde [Being and World], for which two additional unpublished sections were substantially drafted in 1957–1958: La Nature ou le monde du silence [Nature or the World of Silence] and Introduction à l’ontologie [Introduction to Ontology] (Saint Aubert 2013:  28).[3]  These manuscripts, along with many of Merleau-Ponty’s other unpublished notes and papers, were donated to the Bibliothèque Nationale de France by Suzanne Merleau-Ponty in 1992 and are available for consultation by  scholars.[4]