FIELD OF OCTAVES

OVERTONE --------------- UNDERTONE

These are the key patterns of the progression of vibrations... The basic shape is triangular... (a mirror image was laid on the other side of the diagonal to form the pattern)
...A grid was set up...
1/1, 2/1, 3/1... etc.
The harmonies fall along the diagonal...
Do 1/2, Sol 2/3, Fa 4/3, Mi 4/5