The value structure of Boris Grigoriev is mid-key: quiet, controlled, and cohesive. Temperature is cool-dominant, with blue and green families claiming the largest areas. Saturation is deliberately withheld - the beauty here lies in the near-monochromatic gradations rather than colour difference. #BB6138 delivers the chromatic peak at only 4.7% - a small shot of colour with outsized visual impact. From deepest dark to palest light, the palette traverses 61 units of the value scale - a span that creates natural depth. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. This is the light Boris Grigoriev preferred, made measurable.