“
Beautiful Florence has all seven of the fundamental things a city requires for perfection,” the essayist Benedetto Dei wrote in 1472, when Leonardo was living there. “First of all, it enjoys complete liberty; second, it has a large, rich, and elegantly dressed population; third, it has a river with clear, pure water, and mills within its walls; fourth, it rules over castles, towns, lands and people; fifth, it has a university, and both Greek and accounting are taught; sixth, it has masters in every art; seventh, it has banks and business agents all over the world.
”
”