What is full of nothingness in Feng Shui?

Sitting full and facing the sky, also called sitting real and facing the sky, refers to two important directions of the house-there is a backer in the back and an open front. Sitting in the sky is a kind of confusing feng shui. In the air-conditioning geomantic omen, sometimes according to the ups and downs of the mountain situation and orientation, we choose to sit on the ground empty and rush to build it. Once lost, Wu Ji will become a haunted house.