花非花梦非梦
[huā fēi huā mèng fēi mèng]
Translated as 'Flower is not flower; Dream is not dream', it originates from a classical Chinese poem by Bai Juyi, indicating things are illusory and not as they seem. This could express the elusiveness and transient beauty of certain aspects of life, often referring to the impermanence of human affairs.