In Birds, Tagore used many metaphors and symbols to express his thoughts. For example, he wrote in a poem: "My heart is a bird, it sings on your shoulder." This sentence can be interpreted as Tagore's expression of his inner world and his discussion of the relationship between people.
In addition, Tagore also used many natural elements to express his thoughts. For example, he wrote in a poem: "The starry sky at night is like a huge net, covering the whole earth." This sentence can be interpreted as Tagore's thinking about the universe and his exploration of the relationship between man and nature.