“So what I realized when I was a child was that if I were traveling as fast as light while holding a mirror before me, I would not see my image in the mirror, because as fast as the image of my face in light moved toward the mirror, why, just as fast would the mirror be moving away... It is a rather frightening idea, in fact, that if I moved at the speed of light, I could get no confirmation of my existence from an objective source of reflected light such as a mirror. I would be like a ghost in the universe, materially unverifiable in the stream of time.”