The value structure of John Riley is mid-key: quiet, controlled, and cohesive. Heat pervades this palette; warm chromatic identities outweigh cool ones at almost every weight. All colours lean toward grey, building depth through value rather than colour punch. At 12.2%, #5A3921 carries the palette's sharpest chromatic charge: an accent that earns its place precisely because it is withheld. The full value range is 81 units: broad enough to build convincing three-dimensional form. This is the light John Riley preferred, made measurable.