We humans are gaining a better understanding of our world day by day, and we have come to realize that the universe can look profoundly different at different scales. For example, what appears to us to be a perfectly smooth sheet of paper might, from the viewpoint of a microbe, resemble an immense landscape of ridges, hollows, and valleys whose scale may be difficult for it to comprehend. Deep in those valleys might lie enormous boulders that we call cells and can perceive only with powerful microscopes.
For us, too, the universe remains unexplored in many dimensions. For example, what happens to the tiniest droplets of water expelled from our mouths like vapour when we sneeze is a fascinating subject being studied by many researchers, and understanding it may help prevent the spread of disease. At the same time, one of the leading questions in cosmology occupying many researchers is why and how the universe is expanding—and where we came from and where we are going.
To help develop a better sense of scale in the universe, the original link below leads to a page with an interesting interactive animation offering a different view of dimensions that are familiar—or still unfamiliar—to us. By moving its control bar, you can explore the enormous range of scales in the universe, and by clicking the objects you can obtain more information about each one. [source]