The Fifth Elephant (legend)

On the back of Great A'Tuin, supporting the Disc, stand four elephants. There is a legend that in the early days, a fifth elephant stood on A'Tuin's back, but fell off. After a while it smashed into the surface of the Disc, depositing huge amounts of fat, treacle, gold and other resources.

This story, and the metaphors derived from it, provide the title The Fifth Elephant for the novel about valuable deposits of eldritch elephant fat in Überwald, things which do not exist, and things which are not as they seem.