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These ideas were not finished because Leonardo was not very good at finishing projects. He also lacked the resources to put his ideas into practice, such as for his plans for a robotic knight. His designs for various inventions were too far ahead of their time and would not have been understood by his contemporaries. Moreover, the technology was not available to develop his innovative ideas. It was only in later centuries that his designs were appreciated. While Leonardo can be credited with having great ideas, his inventions made little or no impact on the Renaissance. <ref>Gibbs-Smith et al, p. 145</ref>

Leonardo is one of the towering figures in the development of the Renaissance and, indeed, Western culture. He was a remarkable man and a genuine polymath who had extraordinary insights and achievements. The Florentine was able to develop new techniques in painting that revolutionized the art form, and it inspired many of the greatest painters of the Renaissance, such as Raphael. Leonardo had a great influence on sculpture and architecture in Italy during his lifetime and after. Leonardo was also a scientist and interested in a wide range of subjects. His scientific discoveries, such as those in anatomy, were kept secret, largely out of fear of the Church.