https://www.openculture.com/2018/01/western-music-moves-in-three-and-even-four-dimensional-spaces-how-the-pioneering-research-of-princeton-theorist-dmitri-tymoczko-helps-us-visualize-music-in-radical-new-ways.html
Western Music Moves in Three and Even Four (!) Dimensional Spaces: How the Pioneering Research of Princeton Theorist Dmitri Tymoczko Helps Us Visualize Music in Radical, New Ways