Untitled by Li Shangyin, time was long before I met her, but is longer since we parted, and the east wind has arisen and a hundred flowers are gone. And the silk-worms of spring will weave until they die, and every night the candles will weep their wicks away. Mornings in her mirror she sees her hair-cloud changing, yet she dares the chill of moonlight with her evening song. There are no many ways to get to Pengshan, oh blue-birds, be listening!-Bring me what she says!. This is a popular metaphor, which was triggered by Li Shangyin's poems.