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Sculture di Giovanni Arone

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La tetractys contiene gli intervalli consonanti fondamentali: 2:1 (o anche 4:2) rappresenta l’ottava, 3:2 la quinta, 4:3 la quarta, 4:1 la doppia ottava; per questo essa veniva chiamata anche armonia. (“Cos’è l’oracolo di Delfi La tetractys, cioè l’armonia, nella quale sono le Sirene “ – Giambl. Vit. Pyth., 82).

The Tetractys contains the fundamental consonant ranges: 2: 1 (or even 4:2) that is the octave; 3: 2 the fifth; 4: 3 the fourth, 4: 1 the double octave; for this reason it was also called harmony. (“What is the oracle of Delphi? The Tetractys, ie harmony, in which the Sirens are found” – Giambl. Vit. Pyth., 82).