A'Tuin

Let's start with a world that is flat.

It is a disc balanced on the backs of four giant elephants, who are themselves standing on the shell of an enormous cosmic space turtle named Great A'Tuin, slowly swimming through the cosmos

cosmosI am of course talking about Sir Terry Pratchett's Discworld, 41 volumes starting in 1983.

The cosmology sounds utterly absurd, and it is.