Values in Pere Borrell del Caso rest in the mid-range - neither dramatically lit nor steeped in shadow. Cool tones set the register here - the blues and greens easily outweigh any warm accents. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. #90755D functions as the palette's exclamation mark: highest chroma, lowest percentage (6.7%). The value range of 50 units sits in the comfortable middle: enough depth, enough light, neither extreme. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. Pere Borrell del Caso's palette 4 carries its own internal logic while remaining in conversation with the artist's broader colour intelligence.