Baptismal font of the Siena baptistery - The baptismal font of the Siena baptistery is a sculptural work by various artists, made between 1417 and 1430 . Jacopo della Quercia , Donatello, Lorenzo Ghiberti and Giovanni di Turino worked on it, among others, in a sculptural ensemble of great value, a fundamental step in the transition from Gothic to Renaissance sculpture.