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THE METAPHYSICS OF MUSIC
Ptolemy’s Harmonica was also to act as a major influence upon Kepler in the 17th century, when he developed his theory of opticalperceptions and musical consonances. Kepler regarded his Harmony of the World as the most important work of his career. His premise was that, as an integral part of Universal Law, mathematical astronomy is the key that binds all parts together. The astrological and symbolic associations of numbers and geometrical shapes that fill Kepler's text draw directly from the Pythagorean conviction that numbers are more than mere quantities. They are the symbolic organizational code by which the Universe is generated, and by which it may be read and intelligently understood.