A French-language art volume examining the Neumann collection and the visual culture associated with the years around 1900. The work surveys decorative arts, collecting practices, and the artistic currents commonly grouped under Art Nouveau, with attention to the material and aesthetic character of objects from the late nineteenth and early twentieth centuries. Organized as a collection study, the book places the Neumann holdings within a broader European context while also connecting them to Switzerland and Lausanne. It is useful for readers interested in museum-style cataloging, the history of taste, and the relationship between private collecting and public art history. With 204 pages, this edition presents the collection as a scholarly and visual resource, combining contextual history with documentation of individual works and objects.