The Golden Ratio (phi) is common throughout nature, and great works of art and architecture. The number is 1.61803399 and arises in certain spirals which are common to life forms in nature such as certain flowers, sea shells, and in the human body. It was used in the great buildings such as the Great Pyramid of Egypt. The Egyptians called phi the “sacred ratio.” https://www.ancient-origins.net/unexplained-phenomena/golden-ratio-sacred-number-links-past-present-001091