I read somewhere that implied that everything is always travelling at "c" (speed of light) through space-time. The faster you go through space, the slower you go through time and vice-versa. But if you're travelling through space at c - like a photon, then presumably you're 'stationary' with respect to time. So would this mean that the photon would experience the flow of time in the rest of the universe to be infinitely fast? What i'm trying to get at is: what would the experience of the universe be like if you were a photon?