The value structure of Henry Arthur McArdle is mid-key: quiet, controlled, and cohesive. Heat pervades this palette; warm chromatic identities outweigh cool ones at almost every weight. The absence of saturated colour is itself an expressive choice: this is a palette of restraint and atmosphere. #2C2220 at 25.0% of the palette: an overwhelming presence that pulls all other colours into its gravitational field. The highest-chroma note - #653C31 - appears at just 6.5%, deployed as a precision accent against the quieter ground. At 47 units across the value scale, the palette keeps contrast readable without letting it dominate. Henry Arthur McArdle's palette 4 carries its own internal logic while remaining in conversation with the artist's broader colour intelligence.