The Ideal City, c1480-1484. The imaginary city square features a Roman arch typically erected as a commemoration of military victory at its centre. As a whole, the painting offers a model of the architecture and sculpture that would ideally be commissioned by a virtuous ruler who cares for the welfare of the citizenry. The amphitheater is modeled on the Colosseum in Rome. The octagonal structure to the right, covered with coloured stone, suggests the medieval Baptistery in Florence, which in the 15th century was thought to be a reused Roman temple. Together they reflect the importance of security, religion, and recreation in a well-regulated city and the value of Roman ideals in urban design.