The cosmos is extremely complex... Earth is nothing but a speck of dust, and it is insignificant. Yet within this expanse there are innumerable and complex structures of dimensions. What are these structures of dimensions like? ... Which level of dimension does our humankind live in? We live in the surface matter comprised of the biggest layer of molecular particles; we live in between molecules and planets-a planet is also a particle, and within the vast cosmos, it, too, is a trivial speck of dust. The Milky Way Galaxy is also a trivial speck of dust. This universe-the small universe I just described-is also but a trivial speck of dust. The largest particles that our human eyes see are planets, and the smallest particles visible to humankind are molecules. We humans exist in between the particles of molecules and planets. Being in this dimension, you think it's vast; from a different perspective, it's actually extremely narrow and tiny.