Abdullah Suriosubroto distributes its values across the middle register, creating harmony without high contrast. Cool tones set the register here - the blues and greens easily outweigh any warm accents. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. At 9.7%, #AF9E6E carries the palette's sharpest chromatic charge: an accent that earns its place precisely because it is withheld. The palette spans 37 value units: a measured range that delivers coherence over drama. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. Palette 4 sits within the larger chromatic argument that Abdullah Suriosubroto's complete body of work advances.