What are yin angle and yang angle?

Yin angle and Yang angle are angles formed by the intersection of two surfaces. The concave angle is called the internal angle and the convex angle is called the external angle. There is also the simplest way to distinguish: if you hit it, you will hit two bags, that is, the internal angle, and only one bag can hit the external angle.

When decorating, ensure that the external angle and the internal angle are vertical and flat, which can be accepted by the plumb hammer.

Pay special attention to the angle of yin and yang when sticking bricks. Workers should pour two bricks at the joint here at a 45-degree angle to ensure the seam is neat. It is best not to leave a sharp 90 right angle for the outer corner when painting. It is best to grind it into a small arc with sandpaper, which can effectively avoid falling corners due to small bumps in the future. Even the outer corners of tiles are easily damaged by collision, so when laying tiles, you can consider using outer corner lines for protection.