According to Hanshu, "pian" is a Chinese character with many meanings and usages, one of which refers to "snowflake". In calligraphy, "slice" is sometimes used to describe the characteristics of a brushwork or font, which means that strokes or structures have a light, elegant and scattered feeling, like snowflakes. This kind of brushwork or font usually gives people a fresh, natural and smart aesthetic feeling. For example, the cursive script of Zhang Xu, a calligrapher in the Tang Dynasty, has the style of "film". His handwriting is light and bold, and his strokes are random and irregular, floating on the paper like snowflakes. His masterpiece is "Four Ancient Poems", in which there is a sentence "The printed pages are a little red, and the ink flowers are full of paper like clouds", which vividly describes his calligraphy style.