"Nothing amazing about a sphere," said the tortoise. "Come to that, a turtle is a perfect shape."
"A perfect shape for what?"
"Well, the perfect shape for a turtle, to start with," said Om. "If it was shaped like a ball, it'd be bobbing to the surface the whole time."
"But it's heresy to say the world is flat," said Brutha.
"Maybe, but it's true."
"And it's really on the back of a giant turtle?"
"In that case," said Brutha triumphantly, "what does the turtle stand on?"
The tortoise gave him a blank stare.
"It doesn't standing on anything," it said. "It's a turtle, for heaven's sake. It swims. That's what turtles are for."
— Terry Pratchett, Small Gods (Discworld)
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