This is a famous line by Han Yu. The meaning of the poem is: From a distance, the spring grass sprouts, a faint green color, but when you get closer, you can only see extremely sparse grass sprouts. This poem is also It indirectly illustrates that distance creates beauty.
Distance produces beauty is a famous proposition in aesthetics. It means that in the aesthetic process of appreciating natural beauty, social beauty, artistic beauty, etc., people must maintain a specific and appropriate distance, such as time distance, space distance, etc. Distance and psychological distance, otherwise it will affect and weaken the aesthetic effect of the aesthetic subject. It comes from the famous modern poet Huang Ying.