 As a terrifying eruption of the supernatural world into our own, it is similar (though not precisely equivalent) to the concept of pandemonium in English.Over more than one thousand years of history, and its role as a popular theme in traditional storytelling and art, a great deal of folklore has developed around the concept, making it difficult if not impossible to isolate any canonical meanings.One legend of recent vintage states that "every year the "yōkai" Nurarihyon, will lead all of the "yōkai" through the streets of Japan during summer nights."