CHORD PAINTING

Chord encoding (quantized spectrum) generates music (time domain) and painting (space domain) respectively, which are mirror-symmetric: {-7,-4,0} ↔ {0,4,7} mod 12 and can be mathematically converted. 

Chord encoding (quantized spectrum) contains chord geometry semantics {open string|closed string|membrane string}, and its essence is quantum information.

"String" is the geometric semantics of "chord", and "chord" is the characteristic spectrum of "strings". Different chords map different geometric semantics:

Major triad (−7,−4,0)mod 12 ↔ closed string (contour line)
Minor triad (−7,−3,0)mod 12 ↔ open string (Facet line)
Geometric chords: diminished seventh chord (0,3,6,9) mod 12, diatonic chord (0,2,4,6,8,10)mod 12, augmented triad (0,4,8) mod 12 ↔ membrane chord (nonlinear space)
These three chord types together constitute a spatial field, defining all possible spatial states and their interactions.

The above results come from independent observations in chord painting, are repeatable in painting, and are supported by visual experiments.

Chord space is an important pillar and core part of chord language, and painting is its main observation basis and application field.
Observation and experimental cases:
Li, X. H. (2020). Chord Painting. ResearchGate. https://www.researchgate.net/publication/340492620_Chord_Painting 
Li, X. H. (2024). Chord Language. Zenodo. https://zenodo.org/records/11817631 
Griffiths, D. J. (2005). Introduction to Quantum Mechanics. Pearson.