Each rectangual region is a Tonnetz, representing all twelve major keys separated by perfect fifths. There are twelve tesselations in the diagram. See how the top connects with the bottom, and the two sides connect? Voila, torus!
Additionally, I mapped the Circle of Fifths to the color wheel: keys that are closely related (close together on the Circle of Fifths) are closer on the color wheel.
I'm making a crochet model of this now. It will be soft and fuzzy and colorful, hence Baby's First Tonnetz.
By the time I finish this project, I will permanently associate the keys with twelve different colors. C will always be red. Give it to a baby and the kid will probably grow up that way too!
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