Introduction to writing a watch: In the square at the gate of Guanyintang, many gentlemen who claim to be "immortal messengers" have set up small tables, laid out red, yellow and white paper, and are grinding and preparing to write "watches" of ink. "Exhibition" is a religious custom passed down by the Bai people for thousands of years. That is, the priest tells the teacher who writes the "letter" personal information and wishes, and the teacher writes a "letter" combined with the signature, and then puts it into a square "envelope" made of red and yellow paper, with a "seal" on both ends. After printing, it is handed over to the worshiper.