The Golden Mean is a ratio defined as the number Phi (1.618), discovered by the Greek mathematician Pythagoras. It is a self-mirroring ratio of approximately .6 to 1 that produces a harmonic, aesthetically appealing effect in art and design. Michelangelo, Raphael and Leonardo da Vinci employed the Golden Mean in their masterworks. In music, the Golden Mean is a natural way of dealing with divisions of time. Whether intuitively or by design, musicians such as Mozart, Beethoven, Bartok, Chopin, Debussy, Schubert, Bach and Satie may have all employed it in their compositions. You can find the Golden Mean in the organization of the cosmos, and throughout the natural world in nautilus shell spirals, plants, trees and man.