Prevalent in the major works of Leonardo Da Vinci and underlying many of his design compositions, is the phi relationship (also known as the Golden Ratio or the Golden Mean), a ratio of approximately 1:1.618, found in nature and creation, and inherent in the Fibonacci sequence. The Golden Rectangle, the Golden Triangle, and the Golden Pyramid, all based on the Golden Ratio are all appear prominent in the work of Leonardo Da Vinci. He referred to the Golden Ratio as the "divine proportion".
michelangelo's illustrated grocery list. "because the servant he was sending to market was illiterate, michelangelo illustrated the shopping lists — a herring, tortelli, two fennel soups, four anchovies and 'a small quarter of a rough wine' — with rushed (and all the more exquisite for it) caricatures in pen and ink."