Phi in the Mona Lisa

Prevalent in the major works of Leonardo Da Vinci and underlying many of his design compositions, is the Golden Ratio ("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.