Illustration from Burckhardt’s Architecture of the Italian Renaissance
demonstrating the use of the golden ratio in Bramante’s Tempietto. If the two lines that represent the diameter of the lower and the upper section were added together to form one line (a + b), the relationship the sum of the two (a + b) to the larger section (a) is equal to the relationship of the larger (a) section to the smaller (b). In other words, a + b is to a as a is to b. These proportional relationships can be found all over renaissance architecture and art, and are designed to create divine harmony (Burckhardt, p. 70).