What is metaphysics in Feng Shui?

There are two main schools of geomantic omen today, one is the situation school; The second is rational style. Metaphysics is a school of rational style.

Metaphysics theory should have been founded in Yang Junsong in the Tang Dynasty and developed by Jiang Dahong in the late Ming Dynasty. Shen Zhu published in the late Qing Dynasty.

Today, almost all books about the stars flying in the sky are based on Shen Zhu's Metaphysics of Shen Shi.