Euler's Tonnetz
Check out page 147 of Leonhard Euler's Tentamen Novae Theoriae Mvsicae, published in 1739. This work is often referred to as being the first known occurrence of a musical tonnetz ("harmonic lattice"), but I'd never seen the actual image before today.

Hugo Riemann improved on Euler's tonnetz in the late 1800's, drawing it as a diamond pattern.
Wikipedia has a nice, short article on the tonnetz.
The tonnetz is an integral part of the ThumMusic System.


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