The demons are tiny, and legion. Scowling, tongue-flicking devils, no bigger than a thumbnail, and strange animals pile together in a tangle of dog legs and rabbit ears, each smaller than the next. The lines of the painting are so fine that the tiniest figures seem to pull the viewer into an infinite Satanic menagerie. The story of how the demonveggen, or demon wall, came to be is as strange and disturbing as the mural itself. It’s a tale of scandal, fraud, and possible madness that begins with Gerhard Gotaas,…