The classic teapot 3D demo is traditionally used to test realism across 3D engine features.
GrafikDemo, by Niklas Roy (aka Mr. Pongmechanik), keeps the dependency between virtual and real world, but uses only a single part from a computer -the casing- and returns the representation of the pot to the physical world.
The modified Commodore CBM 3032 inner life was replaced by a mechanics. “A wireframe model of a teapot, soldered out of silvered copper wire, is gimballed inside the monitor cabinet. The model is varnished with green uv-active paint and lighted by four blacklight tubes, which are installed invisible inside the cabinet. The teapot can be rotated in any direction by using the numeric keypad. During the rotation, you can hear the electric motors and feel their vibrations.” Just brilliant!