*Uli* is the Igbo women's tradition of curvilinear line art, drawn freehand on skin and painted across the mud (banco) walls of the house. Pressed from uli-plant berries, the dye goes on wood-ash green and oxidises with body heat to a near-black line — fine, flowing, and never retraced. Designs live in generous negative space, with ivory-white *nzu* kaolin held in reserve rather than used as a ground.

This design system distills that tradition into a digital language — a shadowed earth mud-wall page, a near-black *oji* line for structure, oxidising uli-green and earth ochres for accent, and kaolin-white reserved for the highest-contrast marks, never for the background.