Having in each case more or less relation with, but really wholly outside of and superior to all "schools" whatever—except the school of nature, which permits as much freedom as it exacts fidelity—is the succession of the greatest of French sculptors since the Renaissance and down to the present day: Houdon, David d'Angers, Rude, Carpeaux, and Barye. Houdon is one of the finest examples of the union of vigor with grace. He will be known chiefly as a portraitist, but such a masterpiece as his "Diana" shows how admirable he was in the sphere of purely imaginative theme and treatment.