Katsushika Hokusai is high-key - luminous, open, and weighted toward light. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. All colours lean toward grey, building depth through value rather than colour punch. The highest-chroma note - #1E1F32 - appears at just 2.9%, deployed as a precision accent against the quieter ground. A value spread of 67 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. Katsushika Hokusai's palette 4 carries its own internal logic while remaining in conversation with the artist's broader colour intelligence.