The high-key values of Gustave Bourgain give it an effulgent, almost bleached quality. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. Chroma hovers near zero; colour declares itself through subtle shifts in hue rather than outright saturation. #E0D4BF functions as the palette's exclamation mark: highest chroma, lowest percentage (11.3%). 72 units of value range underpin the palette's structural clarity: the eye always knows where light falls. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. Gustave Bourgain's palette 4 carries its own internal logic while remaining in conversation with the artist's broader colour intelligence.