planet4dPlanet 4D Orinal Model feature the most Symmetrical Positionning for 12 Notes or Musical Objects ↩︎; On the Hypersphere of Chords, we display all minor ans major Triads ↩︎;->Some isometries in the Tonnetz discovered by G. Mazzola and formalized in the 4D space by Emmanuel.Amiot and Guillaume Baxias.->Hypersphere of Tonnetze, is a graphical illustration of the work initiated by Louis Bo to