Munsell Colour System

This is a 3D model of the Munsell colour system that specifies complex colour space based on three dimensions: hue, value (lightness), and chroma (color purity).
(see https://en.wikipedia.org/wiki/Munsell_color_system).

It is a great way to use up all those filament ends and looks great on display!

(The second image image is from Wikipedia and the acknowledgment is here:
CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=1955750)