What do you mean, sitting empty and facing full?

Sitting in reality is empty and full, with a cemetery and a house.

In Shen Zhu's understanding of geography, there is such a sentence in the preface: "Anyone who sits in an empty house must take the mountain direction and get the land and get the reason." If you sit empty and your face is full, you can go up the mountain and enter the water. Because of empty space, you get the weather, which is just the opposite of sitting empty and facing full, and the reasons for being empty are different. 」