Yin House Feng Shui: What does the cave look like?

There are many caves in the mountain, with four squares of "depth and width". The left and right are even, and the left and right are different. The intersection of the left and right is called Tibetan mouth, and the intersection of the left and right is not called mouth opening.

The point of the nest should be chord, clear edge, two circles and three bends, and there are slight protrusions in the circle of the nest.

Figuratively speaking, the nest is like a basin, which is raised around, just like a fence, with only one side open. It's similar to the dustpan used in other people's homes, but the mouth is smaller and ring-shaped.