The value structure of Richard Gerstl is mid-key: quiet, controlled, and cohesive. Cool tones set the register here - the blues and greens easily outweigh any warm accents. Mid-saturation across the board: the palette has colour character without chromatic excess. The saturated accent, #BC9669, registers at 8.1% - sparse enough to feel like a deliberate surprise. A value spread of 74 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. Palette 4 sits within the larger chromatic argument that Richard Gerstl's complete body of work advances.