In the novel "Childhood's End" (1953) by Arthur C. Clarke, all humans have a collective premonition, also described as a memory of the future, of horned aliens which arrive to usher in a new phase of human evolution. The collective subconscious image of the horned aliens is what accounts for mankind's image of the devil or Satan. This theme is also explored in the "Doctor Who" story "The Dæmons" in 1971, where the local superstitions around a landmark known as The Devil's Hump prove to be based on reality, as aliens from the planet Dæmos have been affecting man's progress over the millennia and the Hump actually contains a spacecraft. The only Dæmon to appear is a classic interpretation of a horned satyr-like being with hooves.