SYMMETRIES AND PROPORTIONS IN ARCHITECTURE
On 18 August 1418, the Florentine Arte della Lana announced an architectural competition for building the dome of Santa Maria del Fiore Cathedral using Neri di Fioravanti’s design. The two main competitors were two master goldsmiths, Lorenzo Ghiberti (by whom the concept of symmetry was first explained in vulgar Italian) and Filippo Brunelleschi. Lifelong competition between the two remained sharp, but Brunelleschi received the commission, and completed the dome in 1436. It was the first “octagonal” dome in history to be built without a temporary wooden supporting frame, and was one of the most impressive projects of its time.