A 3D model of Johannes Kepler's diagram of the inner planets, first published in his Mysterium Cosmographicum of 1596.  At that time six planets were known, and the hypothesis that their orbits were spherical shells nested between the five Platonic solids seemed as reasonable as string theory does now.

This model shows polyhedra corresponding to the inner planets: Mercury, Venus, Earth and Mars.  Next outwards would be the tetrahedron followed by Jupiter, then a cube and Saturn, the outermost planet known.
 

Kepler's Inner Planets, 80mm glass cube – $72

Without illumination the crystal works best on a dark background.  It comes with clear rubber feet to avoid scratching your desk or mantel. On the left, this light base is a great way to light up your molecule.  It's made of black Formica and has white LEDs that are cool, long-lasting and energy-efficient.  Bright enough for the office by day, or a brilliant nightlight. Light base – $20 I apologize, this light base is backordered to the end of March.  We won't delay the rest of your order to wait for a base (unless you ask), and when they come in we'll ship yours immediately at no extra cost. Thanks for your patience!