My really old old old (2003 old) Dreamcast demo. I think I learned coding in C (and coding in general) a year before.
Was 3rd in that year's Euskal Encounter's Wild compo demo! but basically there are just NeHe OpenGL demos, with some artwork from the signatures of the Frozen-Layer users and some L'ArcenCiel music (which is copyrighted, so a placeholder file is it's place).
This is the version compiled for Mac OS X. Probably won't compile now. You can download a Dreamcast binary and try it with an emulator Scene.org.
It uses KOS as framework.