How to convey that the world is not made of many things? There is a general human assumption that there are many things in the universe and we can give them names, like stars, planets, mountains, buildings, plants, animals, people etc. These may be useful terms, and it may be useful to see and understand the world in this way, but it's not accurate.
The limits that we assume define these objects don't stand up to close scrutiny. For instance, we know the sun to be a star and we can understand the qualities of a star and the phases it will go through. We give stars different names dependent on their mass and evolutionary stage. Currently the sun is classed as a G2V type star, and in time it is expected to become a Red Giant, then later a White Dwarf, then a Black Dwarf. These are names given to different stages of stellar evolution.
But we can't give exact moments when the sun changes from one stage to another, because the change is gradual. All change is gradual. Even sudden change can be seen to be gradual if examined closely. There is no flip switch of change. Even a flip switch for a light involves time for the electric current to flow. It's not really Off-On, it's Off flowing to On. It's an important point. Reality may seem to be dualistic and based on opposites, but really there is a flow of change, a continuum. But that's for another article.
Let's focus back on what we define as the sun. We generally see the circular ball of fire in the sky and think, "That's the sun!" But the sun isn't wholly defined by its visible circular edges. In fact its circular edges are constantly flowing and changing, dipping and rising, and sometimes flaring out. From a distant it may seem perfectly round, but we know that this is not really the case. The sun is a flowing ball of energy. And not only that, it is an expulsion of energy. Animal and plant life on this planet are dependent on the energy from the sun. We can't say at what point the sun's rays are no longer the sun. They are a quality of the sun. A quality that interacts with all it reaches. Similarly, when we see a distant star at night, we see its light, which is its quality that stretches across the universe. Its light is not truly separate from it.
So you see, we imagine that we know things, but if we look closely we find that we cannot truly define them. The same applies to the human body. It is continually in a process of change and interaction with the environment. We can't define where the energy absorbed from the sun, from the air, from drinks and food, becomes the body. It is a continual process of change, structured temporarily as a seemingly finite form.
But the sun and the body are not finite forms. They have no limits. It is the same with all things. To use a less animated example, take a wooden chair. We know what it is, but when did it become a wooden chair? When the fourth leg was added? When its back was added? And at what point were they finally added? Is it when the final turn of a screw happens, that it is then a chair. No. And when does it cease to be a chair? Once some of its parts are removed or once all parts are removed? Once the final screw is released? No. Ultimately, our idea of what a wooden chair is is vague, and it is the same for all objects.
What we've done here is analyse our assumption that things are really what we think they are. We've examined the general human assumption that things are really separate defined things, and found that they are not. Our labelling of things is useful but not as accurate as believed to be. It's good to step back and recognise that assumptions are not necessarily accurate. Really what this all points to is infinity. Nothing can be define because the nature of reality is infinite.