Ah! Chroma is the base NOTE (in whatever scale it’s in) and the tone HEIGHT is the _octave_.
PLUS – there is a neurological structure corresponding to this helix! The VNLL!
The helix idea is over 150 years old and it’s been CONFIRMED as a physical structure. [the bands in the VNLL are the helix]. Hence: This is where notes and octaves happen! [aka Chroma and tone height)