Abat-Jour Conique Jean Prouvé, 1947 During the 1940s, Jean Prouvé designed the Potence wall lamp for his own home in Nancy: a simple light bulb affixed to a long pivoting metal bar, which is supported by a steel wire. In 1947 Prouvé developed a cone-shapedMaterial description Material: steel wire, powder-coated. Fabric cover made of brushed cotton in white, with plastic backing. Product contents: lampshade.