From the perspective of geomantic omen, the house should be square. And "founder" refers to the shape of the house, flat and smooth. But some houses are not completely square, and there will be convex corners and concave corners. So what's the difference between convex angle and concave angle?
1, convex angle refers to the shape beyond the base line of the house in a certain direction, forming an orderly or disorderly redundant part relative to the main body. The concave angle is called the form of missing angle in geomantic omen.
2. The influence of the missing corner and the convex corner of the house is different. Simply put, the missing angle and convex angle should be compared with the overall shape of the house. Whether it is missing or convex, it means that "a small area" is concave or convex. Calculated by the length around the shape of the house, the concave or convex part must be shorter than half the length of the house. On the whole scale, the small concave part becomes a corner, and the small convex part becomes a convex part.
3. If the house is not square, there will be missing corners or convex corners. From the perspective of feng shui, it depends on the specific concave and convex situation to judge its quality.