Courtesy of Formative ModernA nickel-plated tubular steel armchair with calfskin upholstery by French modernist René Herbst. This well-documented design embodies a move towards the aesthetic avant-garde that was set into motion by the Union des Artistes Modernes, a coalition of progressive designers that Herbst helped to found in 1929 that included visionaries like: Eileen Gray, Le Corbusier, Jean Prouvé, Pierre Jeanneret, Pierre Chareau, Robert Mallet-Stevens, Charlotte Perriand and Louis…