One can find it in the classics of experimental literature such as Laurence Sterne's Tristram Shandy or the short stories of Jorge Luis Borges, but also in the horror and fantasy fiction of Stephen King, in Mel Brooks's spoof films and Grant Morrison's superhero comics. The talk is of metalepsis, the transgression of narrative levels. While this device was long perceived as a narratological oddity reserved for avant-garde texts, it has recently emerged as a phenomenon of much wider bearing that exists in numerous media and in popular as well as high culture. When Storyworlds...