Mars Lithophane Terrain Lamp

This is an experimental Mars Lithophane lampshade based on NASA Mars terrain data.

It attempts to depict Martian albedo shading (illumination) internally, and accurate Martian terrain (elevation) externally.

Achieving this in a lithophane was a challenge, as the albedo colour needed to be subtracted from the elevation data and then displaced internally against the terrain surface, towards the centre of the sphere, in order to achieve both visually good elevation, and correct relative wall thickness for the back-lighting effect to look right.

The resulting internal form from those two combined datasets looks weird and random, but is effective in creating the correct wall thickness which softly glows corresponding Martian surface albedo shades through the terrain.

So, In a nutshell, when the lamp is off, the plain white exterior looks like realistic Mars terrain elevation, and when the lamp's turned o