Low fantasy, or intrusion fantasy, is a subgenre of fantasy fiction in which magical events intrude on an otherwise-normal world. The term thus contrasts with high fantasy stories, which take place in fictional worlds that have their own sets of rules and physical laws. Intrusion fantasy places less emphasis on elements typically associated with fantasy and sets a narrative in realistic environments with elements of the fantastical. Sometimes, there are just enough fantastical elements to make ambiguous the boundary between what is real and what is purely psychological or supernatural. The word "low" refers to the prominence of traditional fantasy elements within the work and is not a remark on the work's overall quality. An alternative definition, common in role-playing games, rests on the story and characters being more realistic and less mythic in scope. Thus, some works like Robert E. Howard's Conan the Barbarian series can be high fantasy according to the first definition but low fantasy according to the second. With other works, such as the TV series Supernatural, the opposite is true. History Fantasy fiction developed out of fairy tales in the nineteenth century. Early nineteenth century scholarship in folklore led to fantasy fiction dominating Victorian children's literature. The genre diverged into the two subgenres, high and low fantasy, after the Edwardian era. Low fantasy itself diverged into further subgenres in the twentieth century. The forms of low fantasy include personified animals, personified toys (including The Indian in the Cupboard and The Doll's House; building on the earlier The Adventures of Pinocchio), comic fantasies of exaggerated character traits and altered physics (including Pippi Longstocking and The Borrowers), magical powers, supernatural elements and time slips. French fantastic fiction is predominantly within the low fantasy genre. Low fantasy corresponds to the French genre of "le fantastique" but French literature has no tradition equivalent to English literature's high fantasy. According to David Ketterer, emeritus professor of English at Concordia University, Montreal, the French term Le fantastique "refers to a specific kind of fantasy, that in which the supernatural or the bizarre intrudes into the everyday world; the closest equivalents in English would be 'low fantasy', 'dark fantasy' or 'weird fiction'. 'Le fantastique' does not cover the kind of complete secondary world creation typified by Tolkien's Lord of the Rings. There is no tradition of "dragons and wizards" fantasy in French." Where high fantasy does occur, the terms "le merveilleux" or