Underside of two reduced-size casts showing the characteristic, more angular inner surface of a sand cast produced by the pared-down core (top), and the softer forms of a lost-wax cast (bottom). Auguste Rodin (French, 1840–1917), Burgher of Calais: The Man with the Key, Jean d’Aire, after 1895, H. 47 cm (Harvard Art Museums / Fogg Museum, Bequest of Grenville L. Winthrop, inv. 1943.1154 [top], and modern cast from private collection [bottom]).