This neat model demonstrates how stereographic projection maps a point on a sphere to a point on the plane, using a light source and shadows!
Curves on the sculpture cast shadows, mapping them to a straight line grid on the plane of the floor below.
You can see the effect if you put a light source at the "north pole" of this sculpture
Since we'll be working in the dark anyway, I printed this with Glow in the Dark PLA by Gizmo Dorks. The phosphorescence effect isn't as pronounced as well as the T-Rex model:
I would definitely like to examine more models that make use of light and shadow in this way!