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    In Leonardo da Vinci art heritage, drawing a large number of exercises is also a matter that deserves our attention, these drawings and his official work, to achieve the same high level of artistic drawings as a model. It features: observant, Gangrouxiangji lines, especially good at using different levels of density slash, the performance of the subtle changes of light and shade, his works have everything to sketch as a basis. His theory of art scattered throughout more than 5,000 pages of his manuscript and has not finished "painting", the Renaissance is a major theoretical research results.