Calligraphy emphasizes "expressive form" and "both form and spirit". Whether it is calligraphy or painting, it can only be called technology, not art. The spirit of calligraphy works comes from the calligrapher's mood when writing and his free brushwork. The pen follows his interest, and the book comes from his mood. Density, the change of reality in the overall composition of the book, and the momentum and rhythm running through it.