My understanding: everything is everything in the air, which may refer to the three realms. Things in the three realms are probably rootless, and only people have them. Man is a life beyond the three realms. Because of "depravity", he entered the three realms. Every next layer will add another layer to the body, and when they come down to the real society, it will be our body. This body is gone, which is what we call the Yuan God, which is the soul I understand. In fact, it is to take off the most superficial layer. Outside the three realms, we all have bodies, which are more microscopic, maybe bigger. Things in the three realms are all within the three realms and have no roots. This is the mercy of creation. In the three realms, it gives people a "realistic" appearance. In the view of advanced life beyond the three realms, it does not exist and is illusory. The world is made of matter. I heard that a higher understanding is that the world is made up of energy. Is it that the illusion in the three realms is just the aggregation and arrangement of energy? It is the mercy of creation, but it is also fascinating. The so-called "five aggregates are empty" should mean this. In other words, the person who said this is different from us in perspective and thinking. The world is just a mystery, not our original place. The so-called "return to nature", hurry back and fix it. Endless cycle of pain, only in the three circles.
This is the conclusion I have reached through my own thinking and communication with others after reading some Buddhist scriptures.