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(This review was inspired by Walter Isaacson) Here is a testimony of formidable observational skills. In certain chapters, when Leonardo starts a train of thought, it requires serious effort to trace him. Try it. See if you can follow him in the description of the behavior of water. Almost impossible. You can experience in his notebooks his attempt to describe not only the basic laws of nature but also the entire multiplicity of creation. It is an impossible task but the desire is there, always present. Some of his thoughts are even beautiful, especially when an analogy comes up (beware, the book does not contain drawings of the master).
The regrettable thing is that he was not given a proper education, because without incorporating tradition into your development you have to start everything from the beginning. He would have been a brilliant experimental physicist had he known how to mathematically formulate his observations. Most of his writings remain solely on the level of unrealized ideas. His whole life was unrealized: abandoned projects, unformulated laws, unpublished treatises and paintings left unfinished.
Therefore his most famous drawing of the 'Vitruvian Man' becomes his own Judge: if we regard the drawing as the operation of bringing ideas to fruition ('on earth as it is in heaven'), then, even though Leo often touched the circle with his creativity, the square is completely missing from his life: there are no palpable results. Can such career be considered unfulfilled, or is it sometimes enough to dream? Difficult question.
But one thing is certain - his life was not in vain, because what he left for the posterity in his writings, drawings and paintings is....beauty....Even without execution, the beauty of conception inspires, it is a springboard for the spirit in starting its own quest (his anatomical drawings alone make him a master genius). Also, Leo was universal, and that is a lesson for all of us to be learned: not to narrow ourselves but to broaden our horizon. He loved the whole of creation, and he was right in doing so, because if we ever properly open our eyes, we'll come to realize that the creation is indeed lovable, and that it deserves our complete wonderment. Or, as Leo would put it: 'The genius of man may make various inventions, but it will never discover a more beautiful than nature's, since in her inventions nothing is wanting and nothing is superfluous'