Just a quick user-interface concept mock-up part of Grasshopper 2.0 colour pickers. I’ve been thinking about how to expose a 4+ dimensional colour space on screen. Selected colour in the middle, N rays with either grips or cylinders representing each of the variables; red, green, blue, hue, luminance, saturation, alpha, cyan, magenta, yellow, key, tone, tint, chromaticity, … Possibilities are endless.
A UI like this would be primarily appropriate for modifying existing colours, not so much for picking them.
Rendered using Cycles, all edges done with Curve Piping. Axes distributed equally across the sphere using Grasshopper.