HSL color model mapped to a cube. Rendered in POV-Ray. Source code available at the POV-Ray object collection.
<a href="//commons.wikimedia.org/wiki/User:SharkD" class="mw-redirect" title="User:SharkD">SharkD</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>. Source-code available at the POV-Ray <a rel="nofollow" class="external text" href="http://lib.povray.org/searchcollection/index2.php">Object Collection</a>.