To paraphrase Arthur C. Clarke, any sufficiently advanced technology is indistinguishable from the weavings of Elves:
New materials with the ability to manipulate the speed of light could enable the creation of a “space-time cloak” capable of masking events or even creating an illusion of “Star Trek”-style transportation, according to scientists in London.
The cloak, while currently only existing in mathematical theory, takes advantage of the potential properties of “metamaterials” — artificial materials designed and manipulated at a molecular level to interact with and control electromagnetic waves.
…[Professor Martin McCall of Imperial College London] said current optical-fibre technology could be used to construct a “poor man’s cloak” capable of demonstrating “proof of concept” by imperfectly hiding events taking place over a few nanoseconds.
(From a CNN report.)