Will-o-the-Wisps are featured in Arthur Spiderwick's Field Guide to the Fantastical World Around You. The luminous will-o’-the-wisps are spotted deep in forests, swamps and other desolate places and appear as glowing orbs that move slowly over the landscape. These phantom lights are called by many different names and are even sometimes thought to be a prank of some malicious faerie. Elves particularly delight in using will-o’-the-wisps as a source of illumination and decoration for their revels.