Relativity

The ghost of Einstein is explaining the theory of relativity to me, with a special emphasis on how it applies to ghosts. His face is semi-transparent. I can see the stars through it, dark matter and the swirl of galaxies where his brain had been. He tells me he also considers me a ghost, that he just popped out for a newspaper and saw me here, hovering in mid-air, that an observer would see us both as ghosts, or one of us as being alive, depending on their location in time and space. Nobody, he says, considers themselves a ghost. We're only ghostly relative to others. He says the stars are mainly ghost stars, vanished long ago, their light only reaching us now, a nightly apparition indistinguishable from reality. They still glitter for us, he says, so there's no mystery that we can talk like this although an ocean of spacetime lies between us. He explains how voices travel, and how they can be heard in mumured waves or vivid particles, depending on what's being said, and who's listening.