I love this drawing. I suspect it's by Dave Trampier, it's in his style, and I just love his work. Every time I would open the PHB I would gaze at this drawing for a moment. I liked it that much. So after some years of this, one day I realized that the old wizard was sitting on a d6, and that his book actually says "AD&D" on the cover. Until then I guess I assumed it was some kind of hobbit-hole type of thing.