Mirror Flower, Water Moon (; literally "Mirror Flower, Water Moon"), is a Chinese proverb/phrase (a Chengyu and spread in other languages in East Asia like in Yojijukugo), meaning something that can be seen but not touched, like a flower reflected in a mirror or the moon reflected on the water's surface; something that is beautiful but unattainable dreams, a mirage. It can also mean something that seems so tangible and simple but reflects a much deeper meaning.
This name references , which is the shorter form of a Chinese idiom (or chéngyǔ), literally meaning a "flower seen in the mirror, moon on the water's surface".