Some ancient civilization or another believed that the Earth was a dome carried by a team of elephants, who in turn were carried through the Heavens by a stupendous turtle. It made sense to me, at any rate, when I saw it referenced in a Time-Life book we had called Evolution (there was even a little picture of what such a thing might look like). Then years later Terry Pratchett popularized it in his Discworld books, even giving the turtle a name (Atuan). I did this sketch sometime in the mid-80s, put a little man on it, entitled it "the Commuter", and had it printed on the verso of the Beethoven caricature as a promo piece. So much for cosmology.