The Golden Ratio (Phi, approximately 1.618) is a mathematical proportion found extensively in nature — from spiral galaxies and hurricane patterns to seashells, sunflower seed heads, and the proportions of the human body. In sacred geometry, it is considered the "divine proportion" — a signature of the universal creative intelligence. It appears in the Parthenon, Leonardo da Vinci's Vitruvian Man, and the Great Pyramid of Giza.