Published in 2000, *L' Art 1900* presents a richly illustrated survey of early‑20th‑century decorative design, focusing on the works assembled in the Neumann collection in Lausanne. Georges de Bartha guides readers through the evolution of Art Nouveau and related movements, highlighting key pieces of furniture, metalwork, glass, and graphic design. The volume combines scholarly commentary with high‑quality reproductions, offering insight into the aesthetic principles that shaped the era’s ornamentation. Ideal for collectors, historians, and anyone interested in the visual culture of the 1900s, the book balances academic rigor with an accessible narrative that celebrates the enduring influence of decorative arts.