As part of going through the book Drawing On the Right Side of the Brain, I did some exercises with drawing Picasso and some random knight upside down. I found these to be informative and neat, but fairly boring. So, since I was in the process of playing Myst 4 and all of the Myst games are insanely beautiful, I decided to try the technique on something a little more interesting.
This is the door to Atrus' study in Tomahna, drawn upside down (I reversed it for posting, of course), with as many details drawn as accurately as I could see them.