In the small, southern Italian town of Corigliano, Puglia, I interviewed people about their relationship to color. The descriptions of their favorite colors—the blue of a son's eyes; the pale pink of a cloud; a bright, traffic-light green — served as points of reference for the colors I placed in windows, doors, and niches throughout the Castello di Corigliano. I used pure pigments painted on Pietra Leccese, a natural stone from the area, as I attempted the impossible task of mixing exactly what was described. In the courtyard, pairs of stones faced each other; the painted stone reflected its color onto the natural stone, revealing the dialectic between light and substance. This influence of color was only visible depending on the sunlight of the moment and the viewer’s position in relation to the stones.