This was a realtime rendering demo done in 2005 where everything (meaning music, models, textures, animations, rendeirng engine and application) fit in 60 kilobytes. You can download it from here: rgba.org/iq/demoscene/productions/rgba_195_95_256.zip (for Windows, and Linux).

Most of the data is pure procedural, except some of the models that are only half procedurally created. Sound synthetiser was made Marc S Ressl, models by Borja Morales, Mario Martin and myself, and the rest (rendering code, procedural textures, animations and programming) by myself too. It got first price in the 64 kilobytes demo competition at Euskal Encounter (in Spain).

It's all a remake of a nice demo (realtime too) by the famous polish group Plastic, we just managed to make the same thing in less space.