Whose seal is heaven and earth?

The seal of heaven and earth belongs to Zhang Tianshi. In China's unique reputation system, the development of seals not only pays attention to the seal cutting of the printing surface, but also pays attention to the beauty of materials and physical appearance. A complete and standardized "regulations system" began in Qin and Han dynasties, and the official rank can be seen from the material, buttons and seals of the seals. Influenced by it, in the Ming and Qing Dynasties when epigraphy flourished, there appeared a generation of seal cutting masters such as Wen Peng and Ding Jing, seal cutting masters such as Lin, and material masters such as Shoushan Tianhuang, Changhua Chicken Blood and Qingtian Fengmenqing. The seal collection hides the feelings of literati. Therefore, the seal cutting on the surface of the seal is the soul and value of the seal. Therefore, Tibetans must be proficient in seal cutting to see the content of the engraving, the techniques used, who it comes from, and whether it conforms to the author's technical characteristics. This is the key to identify fakes and evaluate the value of seals. Secondly, the material and carving process of the print button and the print body. In the Qin and Han Dynasties, the crimson seal was classified as a cultural relic, while the history was hidden. In short, a good seal collection has three qualities: good printing surface, good material and good printing button.