Pietro da Cortona is high in key: pale, luminous, and filled with optical air. Pietro da Cortona builds on cool foundations: the palette favours the blue-cyan-green arc. Muted throughout, the palette achieves its effects through value and temperature rather than chromatic force. #E4DBCC delivers the chromatic peak at only 9.7% - a small shot of colour with outsized visual impact. The value range spans 57 units across the palette, providing the full gamut from deep shadow to near-white and ensuring clear tonal hierarchy. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. This is palette 1 of Pietro da Cortona's sequence - a single chapter in a chromatic story told across many works.