"... every now and then, we skirted a universe (or else a universe skirted us), but it wasn't clear whether these were a number of universes scattered through space or whether it was always the same universe we kept passing, revolving in a mysterious trajectory, or whether there was no universe at all and what we thought we saw was the mirage of a universe which perhaps had once existed and whose image continued to rebound from the walls of space like the rebounding of an echo."
- Italo Calvino (The Form of Space from Cosmicomics)
