Someone said Da Vinci's paintings are masterpiece, based on what?

Masterpieces because Leonardo da Vinci’s art works are able to arouse are infinite. His entire oeuvre is a play of references: paintings, nature, machines, his writings, reality, his studies and inventions are all like pieces of the same, complex mosaic. The fabric of Leonardo's works is made from the fibres of his very life, from a wide variety of fields of knowledge, of science and art, all of which come together in his drawings and paintings and in the incredible machines that his genius allowed him to design.