What does it mean to draw lots to tell fortune and throw dirty things into clear water?

Hello, uncle bean family at your service. Generally speaking, I think that adding soil to clear water is to increase aura. Earth is the foundation of all things. In the five elements, soil is in the center, which can absorb all kinds of aura and increase the accuracy of calculation and prediction. Of course, it is not necessarily soil, but also the ash in the incense burner and the soil in a specific place. Of course, the reason is the same, let the aura in the soil dissolve in water.