Simple language and comfortable rhythm. Lin Wuxian, the author of Autumn Letters, is a famous children's poet in Taiwan, China. The children's poems he creates pursue childlike innocence, poetic heart and imagination. This poetry genre is characterized by concise language and comfortable rhythm. The poem uses two rhetorical techniques: personification and metaphor. It compares autumn to a good friend of mankind, the autumn wind to a "postman", and the leaves to "letter paper".