After I put it up a student asked me if I drew it. Yes, yes I did. Because before I was a math teacher I was a Norwegian expressionist painter who died in 1944.

By the way, I just photoshopped this and split it up onto 9 pages, then used the Math Department color printer to print it off (oops). If you want the files, here they are in a compressed folder (nine 8×10 images and the original full file).