Tetraktys

The tetractys (Greek: τετρακτύς), or tetrad, or the tetractys of the decad is a triangular figure consisting of ten points arranged in four rows: one, two, three, and four points in each row, which is the geometrical representation of the fourth triangular number. As a mystical symbol, it was very important to the secret worship of Pythagoreanism. There were four seasons, and the number was also associated with planetary motions and music.

De Perugia: Chansons - 2016-11-28T00:00:00.000000Z

Codex Chantilly III - Bibliothèque du Château de Chantilly, Ms. 564 - 2016-06-21T00:00:00.000000Z

De tristresse, de deuil, de desplaysance - 2015-12-07T00:00:00.000000Z

O tu cara sciença mie musica (Works from the Squarcialupi Codex) - 2015-11-24T00:00:00.000000Z

Johannes Heer Song Book (Cod. St Gallen 426) - 1970-01-01T00:00:00.000000Z

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