LSE4313565 Portrait of Claude Nicolas Ledoux (1736-1806), with his daughter Adelaide. (Ledoux holds the plans for the house of the director of the industrial city of Arc et Senans (Franche Comte), the ambitious programme of this ideal city, which remained unfinished, applied the rationalist principles of urban planning developed by visionary architects at the end of the 18th century). Painting attributed to Antoine Francois (Antoine-Francois) Callet (1741-1823), oil on canvas, 18th century, French art. Musee Carnavalet, Paris, France. by Callet, Antoine Francois (1741-1823); Musee de la Ville de Paris, Musee Carnavalet, Paris, France; (add.info.: Portrait of Claude Nicolas Ledoux (1736-1806), with his daughter Adelaide. (Ledoux holds the plans for the house of the director of the industrial city of Arc et Senans (Franche Comte), the ambitious programme of this ideal city, which remained unfinished, applied the rationalist principles of urban planning developed by visionary architects at the end of the 18th century). Painting attributed to Antoine Francois (Antoine-Francois) Callet (1741-1823), oil on canvas, 18th century, French art. Musee Carnavalet, Paris, France.); Photo by Leonard de Selva.