Ask, clouds and cranes have strange wings, and seagulls have no worldly feelings. What does that allusion mean?

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Cloud cranes have strange wings, but seagulls have no worldly feelings. .

From "Gift to Mr. Cui Zhongzhi" by Li Bai of the Tang Dynasty

Translation: Cloud cranes have unique wings and fly high above the clouds. Seagulls have no worldly feelings and are indifferent to the world. Fight to fly freely.

Meaning: The poet uses objects as metaphors for people, and clouds and cranes as metaphors for himself, expressing the poet's feeling of being extraordinary and unappreciated.