I have heard it said that, somewhere in the world, there is someone who could be your exact double. Now, I’m not referring to genetic twins. I am talking about look-alikes who have no blood relation to you whatsoever. Whatever its scientific basis, this spooky notion has often found its way throughout literature, mythology, and film. The Germans name this ghostly counterpart a “doppelganger”; the French, a less awkward “sosie”. That there could be a twin stranger somewhere in the world may strike you as unsettling—or quaintly amusing. But if you ever did cross paths with your doppelganger, you could at least take solace in the fact that the resemblance would be merely skin-deep. This mirror companion would not actually be you.