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planet4dPlanet4D Main Menu Toggle. Planet4D Models; Planet4D Models – Planar; Planet4D Videos. Planet4D Videos Conferences; Planet4D Videos Examples; Planet4D Videos Theory.Planet4D Videos; Planet4D Videos Theory; From Circle to Hyperspheres. When Tonnetze go 4D. Isometries & Spectral. Graphs & Tonnetze. Temperaments. Episode I. Episode II. Episode III.