Although there is only one moon, many moon shadows can be projected on the surface of the water. If a person's mind is as pure as water, he must reflect (reveal) enlightenment and wisdom. Like the Buddha (moon), humans (moon shadow) should have similar qualities.
A symbol of "present." "Truth" is appearing in the natural world.
A symbol of "nothing." "Kleshas" are cleanly dispelled and do not exist.