Nanopublication — Spread Voicing of Db Major 7 in AQC0938

Context

The voicing encoded in this painting is: **Db1 — F2 — Ab3 — Db4 — Ab4 — C5**.

This is not a simple Db Major triad but a Db Major 7 chord, with the natural 7th (C) appearing as the uppermost voice. The C5 registers as red-orange in the painting — consistent with my chromesthetic mapping of C to Red, the anchor of the circle of fifths to color wheel system [3]. The computational image analysis [2] assigned this zone to the "red-orange" family (20.9% of the image surface, the largest single color mass), confirming the dominance of C in the upper register.

The spread voicing opens across the paper the way it opens across the keyboard. In my chromesthetic system, register is a clarity gradient with darkness at one extreme and lightness at the other. Low register tones converge toward darkness — whatever their pitch color, they lose chromatic clarity as they descend, tending toward near-black. High register tones converge toward lightness — they too lose chromatic definition, bleaching toward white. The full hue lives in the middle registers; the extremes dissolve it. The intent is directional: the voicing moves from obscurity below through chromatic clarity in the middle to luminous dissolution above. This register-to-brightness encoding [4] is consistent across the Synesthetic Explorations series.

The chord tones and their chromesthetic translations are: - **Db1** — blue-green (cadetblue, very dark) — bass foundation - **F2** — orange (darkslategray, dark) — accent, low inner voice - **Ab3** — blue-violet (darkcyan, mid-dark) — inner voice - **Db4** — blue-green (cadetblue, mid-light) — upper inner voice, octave doubling of root - **Ab4** — blue (dodgerblue / deepskyblue) — upper fifth, appears twice in the voicing - **C5** — red-orange — the major 7th, uppermost voice, dominant color mass

A note on chromatic ambiguity at the register extremes: the bass zone (Db1) and the upper zone (C5) both fall where my color blindness and the register gradient converge to produce areas of merging, indeterminate hue. At low register, tones darken toward near-black regardless of pitch color; at high register, they bleach toward light. My color blindness compounds this — in these zones, I lose reliable chromatic discrimination. The result is not error but a structural feature of the system: the extremes of the voicing are zones where chromatic identity dissolves into register identity. The intent is clear; the precise hue is not, and that ambiguity is part of the painting.

The presence of the major 7th (C) as the largest color field in the painting is compositionally significant: in a standard Db Major triad, C would be absent. Its dominance here reflects a deliberate pianistic choice — the Maj7 voicing — that the chromesthetic translation makes visually explicit as the red-orange mass anchoring the composition's upper zone.