The so-called Huang Wu, some people call it the Five Ghosts, which is a powerful detective in Kanyu. Some temples worship five ghosts every year for the safety of livestock. In fact, the real power of the five ghosts refers to the central position of a room; If we draw three lines on the top, bottom, left and right of a square room and divide the house into nine squares on average, the middle grid is the location of the five ghosts. Just because the Five Ghosts are powerful earthworms, it is said that the Five Ghosts can't put any energy ornaments that contribute to the pollution. Otherwise, once these dirty gases stimulate the energy of the five ghosts, it may affect the good luck of the residents of this house. So that's why the toilet can't be built in the middle of the house.