Explain the author of the geographical indication.

Guan Lu (210-256) was a warlock of Wei in the Three Kingdoms period, whose name was Gong Ming. He is a famous physiognomist in history and is regarded as the founder by later scholars of geomancy. Guanshi Geography is a valuable cultural heritage left by Guanlue, which is still widely circulated today. It is a must-read book for geomancers and geographers in past dynasties.