The moon can be used by authors to express sadness. Li Yu once wrote: "When will the spring flowers, autumn moon and autumn moon end, and how much do we know about the past? Last night there was an east wind in the small building, and the old country cannot look back to the bright moon" ("Yu Beauty"). He used this to lament the impermanence of the world, like smoke like a dream, the former songs and dances, carved beams and paintings of the former country of Jinling can only be reproduced in memory - the so-called impermanent; and spring flowers and autumn and the moon are unchanging - the so-called eternity. Spring flowers, autumn and moon of the beauty can only more and more set off the country's destruction, the king fell into the sadness of the prisoners. The moon is eternal, but the things of the world have long been things are not the same, the sadness from the, especially bleak.
Second, the expression of joyful and sweet feelings
Love poetry often appears in the "moon" imagery: one is because of the unique romantic atmosphere of the moonlit night, especially suitable for the tenderness between lovers, outlining the lovers of the lingering love; two is because of the moon's bright and immaculate, the everlasting can be a symbol of love, and the moon is a symbol of love. The second reason is that the moon is bright, flawless and everlasting, which symbolizes love that is unswerving and everlasting. Yan Guidao "six orders" in the "idle clouds return, the moon in the courtyard flowers of the old corner of the railings" line explains the location of the lovers meeting environment, rendering the atmosphere of the situation.
Three, express separation, longing for the sadness
A sentence "raise your head to look at the moon, low thinking of the hometown" is familiar to everyone, in fact, the moon is one of the most able to evoke feelings of homesickness. Poets throughout the ages have used the moon to express their homesickness." Su Shi's "Song of Water" in the "wishing for a long time, thousands of miles *** Candian Juan" should be the most open realm, the poet wishes the world suffered from the pain of separation of loved ones, friends, lovers can be physically and mentally unharmed, *** enjoy the moonlight.