In the library of the observatory in Ondrejov, above Prague, I once found a catalogue of stars that astounded me. It had hundreds of pages with tables of stars that had been observed and confirmed to exist. Towards the end there was a table of stars thought to have been observed but confirmed to not exist. But to my astonishment, at the back of the volume I found a list of stars which had never been observed and did not exist. Perhaps the most amazing thing about the universe is that we could create an infinite catalogue of things, worlds and beings that no one has seen and which do not exist. Each story in the realm of fiction is a small part of that catalogue.
