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
Day of the Dead year, including gathering the goods to be offered to the dead. During the three-day period families usually clean and decorate graves; most visit the cemeteries where their loved ones are buried and decorate their graves with "ofrendas" (altars), which often include orange Mexican marigolds ("Tagetes erecta") called "cempasúchil" (originally named "cempoaxochitl", Nāhuatl for "twenty flowers"). In modern Mexico the marigold is sometimes called "Flor de Muerto" (Flower of Dead). These flowers are thought to attract souls of the dead to the offerings. It is also believed the bright petals with a strong scent can guide the souls from cemeteries to