There is a kind of double that is called the Gothic Double. And it has to do with exactly that period in the 19th century when this kind of disturbing doppelgänger starts to appear in fiction. And one reason for it, which is really interesting, is because of the expansion of British Empire. I mean, I'm talking mainly about English literature, which is what I know best here. You start to get all kinds of ethnic myths and ideas that creep into England and into the literature. You get, you know, the Celtic Fetch, which is this uncanny double, the German Doppelgänger, the English have their Wraith, and all of these figures are terrifying. And so what you start to get in the literature of this time is horror moving from a location, moving from a place like the haunted house —which is a kind of double itself of the home — to the self.