There is a school in Feng Shui that uses ghosts and says that it is not a ghost. Its fundamental core is that everything is a kind of energy, which is called "Shaqi". Ghosts are also a kind of energy, and each kind of Sha Qi has different characteristics. Ghosts are something congenial, so they should be special. So the method of treating ghosts is called treating ghosts. Is a way to use this energy.
Therefore, looking at the face in the dark, in this school's view, is a kind of Sha Qi deformation, just like a movie, although covered with a large piece of cloth, it shows thousands of images. Therefore, ghosts really have nothing to be afraid of, and they are too scared to know how to cure them. But it's generally okay. When the sun is the spirit, it will disperse.