Refreshing some memories: large spinning #dodecahedron on the #flipdot wall at #32c3. The shading is flat, the grey level value calculated from the angle between the face normal and the light source vector. Then a matching #Bayerpattern based dithering is applied for filling the faces.

The second picture shows a simulation done with the same code based on #Dezipixel, our custom graphics library for devices with few but large pixels.