Gustave de Smet occupies the comfortable middle of the value scale, avoiding both extremes to hold the eye in a sustained middle grey. Gustave de Smet builds on cool foundations: the palette favours the blue-cyan-green arc. The absence of saturated colour is itself an expressive choice: this is a palette of restraint and atmosphere. #957B57 functions as the palette's exclamation mark: highest chroma, lowest percentage (10.0%). Spanning 53 units on the value axis, the palette achieves the balance between tonal flatness and fragmentation. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. In the context of Gustave de Smet's full range of palettes, group 6 represents one movement in an ongoing chromatic dialogue.