The last sentence of calligraphy, the beauty of China culture, is explained by what method and what is its function?

The beauty of China culture in calligraphy is illustrated by analogy in the last sentence, which is more vivid and easy to understand. According to relevant public information, this paper compares the beauty of lines and colors of calligraphy with the beauty of human appearance, and the inner beauty of calligraphy with the beauty of human connotation, indicating that the real beauty of calligraphy lies in the unity of inner beauty and outer beauty, which makes the explanation more vivid and easy to understand.