The disc, being flat, has no real horizon. Any adventurous sailor who got funny ideas from staring at eggs… — Terry Pratchett
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.
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"I suppose you wouldn't happen to know the way out of the forest, possibly, by any chance?"
Weems might have had a room-temperature IQ, but he knew idiocy when he saw it.
He wanted to say all this, and couldn't. For a man with an itch to see the whole of infinity, Twoflower never actually moved outside his own head. Telling him the truth would be like kicking a spaniel.

