How many people really dream of making a fish all day?

How many people can really become deer, or fantasize about being a fish all day? According to the relevant information of the query, this sentence is an exaggeration to express that people often pursue unrealistic fantasies, but often ignore the present reality. In this poem, Bai Juyi reflects the impermanence and change of life by describing the changes in nature and the shortness of life, reminding people to cherish the beauty in front of them and not to pursue illusory ideals and desires too much.