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books.google.com - Clouds are not spheres, mountains are not cones, and lightning does not travel in a straight line. The complexity of nature's shapes differs in kind, not merely degree, from that of the shapes of ordinary geometry, the geometry of fractal shapes. Now that the field has expanded greatly with many active...https://books.google.com/books/about/The_Fractal_Geometry_of_Nature.html?hl=zh-CN&id=xJ4qiEBNP4gC&utm_source=gb-gplus-shareThe Fractal Geometry of Nature
