What are three paths

Three paths: At the end of the Western Han Dynasty, Wang Mang's dictatorship, the governor Jiang Xu resigned his official seclusion, and "opened three paths" under the bamboo shade in the garden, only intersecting with Yang Zhong and Qiu Zhong. The place where hermits live.

Tao Qian in the Eastern Jin Dynasty "Return to Ci" : "three paths on the wilderness, pines and chrysanthemums still exist."

Tang Bai Juyi "want to have a gift with Yuan eight neighbors" : "The bright moon is good with three path night, green Yang Yi for two spring."