Umm.. on Discworld the Turtles swim through space, they don't stand on each other.
But I was thinking of the now well-known anecdote.
http://en.wikipedia.org/wiki/Turtles_all_the_way_down
Quote:
Originally Posted by RickyMaveety
It's elephants all the way down in the Buddhist parable. It's only turtles all the way down on Discworld. 
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