Ring Circle

A key's ring of chords as a circle of clickable nodes in line-of-thirds order, where neighbours share all but one note and a move of k nodes shares all but k. Edges carry the notes neighbours share, moves are drawn as arrows across the circle with the active one bold, and the hinge gets a heavier rim. Nodes arrive with their name, quality icon, ring label and pitch classes already chosen, so the same figure draws a traditional I to VII ring or any cycle of chords.