Segundo o autor, David Brin, em seu site, Existência está tangencialmente relacionado com as Sagas da Ascensão.
- I've posted here two short stories based in the Uplift universe. One, "Aficionado", first appeared in Popular Science and is now part of Existence. This story details the very beginnings of Earth's Uplift Project. The other, "Temptation," first appeared in Robert Silverberg's anthology Far Horizons and features the adventures of a female dolphin on the faraway world, Jijo, who must escape from two of her own kind and then penetrate a deeply dangerous ancient secret. From: Existence Website