The Forbidden Fountain of Oz food, which occurs most famously in the "forbidden fruit" of the Tree of Knowledge of Good and Evil in the Book of Genesis, but in other contexts too. The idea of water that purges the drinker's memory is also ancient. In Greek mythology it occurs as the river Lethe: the souls of the dead lose their memories of their earthly lives by drinking its water. The same idea can also be found in Eastern and other literatures, as in the "Well of the Waters of Forgetfulness" and other guises. "The 'Drink of Forgetfulness' is found in Greek, Hindu, Norse, and
Greek underworld Greek underworld In mythology, the Greek underworld is an otherworld where souls go after death. The original Greek idea of afterlife is that, at the moment of death, the soul is separated from the corpse, taking on the shape of the former person, and is transported to the entrance of the underworld. The underworld itself—sometimes known as Hades, after its patron god—is described as being either at the outer bounds of the ocean or beneath the depths or ends of the earth. It is considered the dark counterpart to the brightness of Mount Olympus with the kingdom of the dead