Sometimes, when we are looking at some pictures, we notice only a system of lines that makes a kind of landscape, an organic form. We don’t really know if that is a river, a tree, or anything else. If we grow a small thing, or we reduce a big one, we don’t know exactly anymore what we are looking on. If we change scales, we get interesting pictures because striking similarities come out from the observed structures. What we see depends finally on our point of view.