Fortune-telling ashes don't drop.

From the materialistic point of view, the quality of incense and the spatial position of burnt incense ash are in a relatively coincident state, so the incense ash can maintain its original shape.

From a superstitious point of view: this is the saying that every place has every place. At the same time, it should be judged by combining the state and expectation of the person who burns incense. As your statement is not detailed enough, I can't explain it to you.