Hello, this question or idea might seem a bit surreal, although over the last months i started to wonder about the way we percept the world and take conclusions from it. Before the atom was found, mankind wondered if there could be a particle that could no further be divided. Experiments have shown to us that that particle is the atom. But what is the principle behind this? What guarantees to us that by looking at a smaller scale we are indeed going into the composition of things? What if it is just an illusion that when i look at a piece of wood and see its cells, molecules, and if it could be possible, atoms, it is indeed what composes the piece of wood? Could all our physical knowledge be the result of illusions that make our world look like something we perceive as logical, but in fact is nothing like that? Can our vision be wrong? Can all our physical experiments be wrong? I mean, we tried to look at things in a smaller scale because we believe that things are composed by other small things; what if this reasoning is wrong and what we actually see is something completely different, with a completely different nature?