Immortality theories:
Daoism Handbook by Livia Kohn p. 110-112 Penglai paradise
p 113 contracts for safe passage in the underworld – bronze mirrors with feathered figures/immortals /Xiwangmu etc= cosmic markers and orientations to ensure the dead arrive
“The idea that the peach was a kami appears to be connected with the Chinese conception of a peach world-tree, a form of the Mother Goddess, the fruit of which contains her ” life substance ” or shen as do the jewels like the pearl and jade objects; the peach is a goddess symbol as the phallus is a symbol of a god.”
Myths of China and Japan by Donald Alexander Mackenzie.