It's the Astrologer from Mark Twain's, The Mysterious Stranger: "On the fourth day comes the astrologer from his crumbling old tower."And yeah, awesome is the word for it.
Definitely needs to be used as a module cover. I can imagine all sorts of nasty secrets and tempting loot in that paranoid wizard's tower.
If roleplaying games were invented in the 1920s instead of the 1970s, I've no doubt NC Wyeth would be to roleplaying games what Dave Trampier was.
Wyeth is amazing.