If you curl up quietly on the rocks somewhere along Maine’s rocky coast—maybe wear dark, camouflage clothing—and wait until the moon lights up the choppy water, you might see any number of fantastical sights. Mermaids, and selkies too. If you watched just about the spot where the waves hit the shore, you may see fairies flitting between the flecks of spray, each their own dynamic Venus. Ghosts...