It makes me remember John Locke's An Essay Concerning Humane Understanding[0]
> The Indian before mentioned [...], saying that the world was supported by a great elephant, was asked what the elephant rested on; to which his answer was—a great tortoise: but being again pressed to know what gave support to the broad-backed tortoise, replied—SOMETHING, HE KNEW NOT WHAT
> The Indian before mentioned [...], saying that the world was supported by a great elephant, was asked what the elephant rested on; to which his answer was—a great tortoise: but being again pressed to know what gave support to the broad-backed tortoise, replied—SOMETHING, HE KNEW NOT WHAT
-- [0] http://www.gutenberg.org/cache/epub/10615/pg10615.txt, 2nd book, chapter XXIII, paragraph 2