Since the new "Tron" flick just opened--I'm going tomorrow--here's a tank from the original,
from 'way back in my high-school days in January, 1985. A few months later, I forgot about "Tron" and went nuts over "Back to the Future."
Done in drafting pencil, colored pencil and drawing markers on plain typing paper. Stuff like this is why I failed Drafting class--but I didn't do well in Art, either, because in both cases I was working on my own stuff (like this) instead of working on assignments.