John Duncan keeps values measured and balanced, a hallmark of tonal restraint. John Duncan keeps warm and cool in parity, a balance that lends the work a perceptual shimmer. All colours lean toward grey, building depth through value rather than colour punch. Only 5.8% is devoted to #7E594B, yet that small allocation delivers the palette's entire chromatic tension. At 60 units of value range, the palette has the tonal breadth to sustain complex spatial readings. This is palette 4 of John Duncan's sequence - a single chapter in a chromatic story told across many works.