What is the Pythagorean concept of the Tetractys?
The Tetractys is a sacred figure, a triangular arrangement of ten points: one at the top, then two, then three, then four. It represents the perfect number 10 and embodies the fundamental principles of the universe. It is composed of the first four numbers – 1 (monad), 2 (dyad), 3 (triad), and 4 (tetrad) – which, when summed, yield 10. This sequence generates the ratios that define musical harmony, thus linking numbers, music, and the cosmos in a divine unity.
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