Jean-Thomas Thibault. Project, a monument for Jean-Jacques Rousseau at the Jardin des Tuileries, watercolour 340x492 mm. Galerie Heim, Paris.
Found this image on Vulgare. Thibault, 1757-1826, was a landscape painter and architect, trained under Boullée, went to Rome, built la Petite Malmaison for Josephine and restored the Palais de l'Elysée. He taught at the Beaux-Arts from 1819 to 1827. The monument itself is the sculpture in the centre of this small islet, but today we see the formal circle of trees first, the near druidic ceremony of the enclosed field. Of course I see Alesia, again.