It is described that installing an arrow-shaped iron window or a protective wall welded with steel bars in order to guard against theft will inevitably form a sense of suffocation on one's own or others' houses. This kind of suffocation is generally called an arrow through the heart.
Good or bad luck is responsible, there will be blood vessels.
If the situation is not strict, convex mirrors can be used to solve it. If there are many such evils, we should use Shanhai Town to solve them.