Since ancient times, seals have been a proof of identity and a symbol of power in China. Seals are not only functional, but also an art form, an ancient art combining calligraphy and engraving, often regarded as independent works of art alongside calligraphy and painting. From the selection of materials, the craft of production to the design of characters, seals have extremely rich aesthetic expressions. Artists in other countries usually sign their paintings, while Chinese artists often stamp seals on their paintings instead of signing their names. In this way, the seal also becomes a part of the work, which is a way to reflect the uniqueness of the work.