planet4dPlanet4D Videos Theory; Planet4D From Circle I; From Circle to Hyperspheres. Episode I : When Tonnetze go 4D. Episode I. Episode II. Episode III. Episode IV. Chapters. 0 Intro; 1 NewtonPlanet4D Videos Theory; Planet4D From Circle I; From Circle to Hyperspheres. Episode I : When Tonnetze go 4D. Episode I. Episode II. Episode III. Episode IV. Chapters. 0 Intro; 1 Newton