Joke Collection Website - Talk about mood - Why did people in the past treat people as "my host"?

Why did people in the past treat people as "my host"?

The Quli Chapter in the Book of Rites records: "The master is in the east rank, the guest is in the west rank, and if the guest is inferior, it is in the master rank. The host said nothing, and then the guest returned to the west stage. "

this sentence is about the rules of etiquette between host and guest. It can be seen from the text that the "east" position represents the master. What we usually call "hosting" (host's treat) and the host have this meaning.