Frank Xavier Leyendecker is high-key - luminous, open, and weighted toward light. Temperature is cool-dominant, with blue and green families claiming the largest areas. All colours lean toward grey, building depth through value rather than colour punch. The most saturated colour, #C13B2D, is reserved to 2.3% of the surface, where it acts as a focal punctuation. 75 units of value range underpin the palette's structural clarity: the eye always knows where light falls. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. This is palette 1 of Frank Xavier Leyendecker's sequence - a single chapter in a chromatic story told across many works.