This drawing -- which I think dates from back in the early 1980's -- is an example of what I like to call "adaptive re-use". In this case, I had spent quite a bit of time drawing this corridor full of machinery, and I believe originally there was a robot peeking out of that doorway. I thought it might be handy to be able to re-use parts of this drawing, and so created an acetate overlay onto which I pasted the drawing of the barbarian with the sword (you can see that it doesn't line up precisely with the rest of the drawing -- when I took this photo, the acetate had shifted).
I think I did this a few times with various things I didn't want to re-draw, but it never became a real habit with me. -- PL