The horror story has long been a staple of popular fiction. For instance, Edgar Allan Foe's "A Tale of the Ragged Mountains" (1844) is "framed" and has a main character who recounts to the narrator a tale that may be a hallucination or real. The idea that dreams symbolize the creative side of human nature is also commonplace, as in H. P. Lovecraft's The Dream-Quest of Unknown Kadath (1939; c. 1926). The image of a woman representing inspiration dates back at least to the Ancient Greeks' Muses of the arts, and perhaps even earlier according to Graves's own The White Goddess (1948).