Claude Nicolas Ledoux was an influential French architect and urban planner during the late 18th century. Some of his most notable works included the Royal Saltworks at Arc-et-Senans, which was an ambitious early example of an architect-designed factory complex arranged in a large semicircular plan; the Theatre of Besancon, which had an innovative interior design that segregated audiences by class; and numerous toll houses across Paris marked by heavy neoclassical architectural styles. Ledoux aimed to use architecture to visually represent different occupations and social roles through symbolic building designs and forms.