A fractal is an object or quantity that displays self-similarity, in a somewhat technical sense, on all scales. The object need not exhibit exactly the same structure at all scales, but the same “type” of structures must appear on all scales. When you look at a fractal through a microscope, it looks the same as if it were not magnified. In other words, every irregularity is repeated again and again at a smaller scale every time you increase the magnification. In the fractals below, you can see smaller and smaller images of the larger picture.