The disc, being flat, has no real horizon. Any adventurous sailor who got funny ideas from staring at eggs and oranges for too long and set out for the antipodes soon learned that the reason why distant ships sometimes looked as though they were disappearing over the edge of the world was that they were disappearing over the edge of the world.
Terry PratchettThere should be a word for that brief period just after waking when the mind is full of warm pink nothing. You lie there entirely empty of thought, except for a growing suspicion that heading towards you, like a sockful of damp sand in a nocturnal alleyway, are all the recollections you'd really rather do without, and which amount to the fact that the only mitigating factor in your horrible future is the certainty that it will be quite short.
Terry Pratchett