PLANET4D

planet4dPLANET4D OFFICIAL > Only members can see who's in the group and what they post. 󰛻. Visible. Anyone can find this group. 󰛐. View group info. See moreBeside a geometrical part that has been calculated with the help of the graph theory, the Planet-4D model includes twelve ideograms that can either symbolize notes, chords or scales