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A recent blog post on thatsmaths.com was about Tonenetz, a diagram of harmonic relationships of notes. Tonenetz means 'tone network' in German :-)
Do you have a link to the post in thatsmaths?
I first became aware of this concept many years on Gary Garrett's blog, where he primarily refers to it as "the lattice." His introduction to the concept gives a brief history:

https://www.garygarrett.me/?p=342

More introduction to the lattice:

https://www.garygarrett.me/?p=995

https://www.garygarrett.me/?p=1632

https://www.garygarrett.me/?p=1696

Some comparison audio between equal temperament and just intonation:

https://www.garygarrett.me/?p=1812

Some songs with lattice animations:

https://www.garygarrett.me/?p=103

https://www.garygarrett.me/?p=1253

I also like this book which Gary recommends, although it's very challenging and I never made it all the way through:

https://www.amazon.com/Harmonic-Experience-Harmony-Natural-E...

As an indie music composer, this kind of unusual tone arrangement is great for creativity, thanks! I noticed that the same triangle will play different chords from time to time, is that on purpose?
"Almost Tonnetz" fail:

https://en.wikipedia.org/wiki/Stradella_bass_system

Accordion buttons have a row of roots with major thirds off on a diagonal, but in a shifted way that you don't have minor thirds on the opposite diagonal. E.g. there is no CEG triangle.

If the layout did that, you could hit minor and major triads chords by pressing triangles on the first two rows.

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