506 years ago today, on May 2, 1519 (April 4, 1519, the lunar calendar), Da Vinci passed away. On April 15, 1452, Da Vinci was born in Florence, Italy. Da Vinci loved painting since he was a child. At the age of 14, he followed his father to Florence and entered the art workshop hosted by the famous painter and sculptor Verrozio to learn painting. Verrozio has strict requirements on his students and his training methods are also unique. He first refused to allow Da Vinci to copy ancient famous paintings, and did not talk much about painting theory. Instead, he asked Da Vinci to sketch from an egg. After drawing for several days, Da Vinci became impatient, and Verrozio said to him: "Out of a thousand eggs, there have never been two eggs that have exactly the same shape; even if it is the same egg, if you look at it from a different angle, its shape will be different." Da Vinci remembered the teacher's teachings, practiced hard basic skills, and finally mastered painting techniques skillfully. Da Vinci was a humanist who focused on life in his paintings and strived to create true and vivid artistic images. Once, as an assistant and a teacher, he collaborated on a painting. Because Verrozio could not escape the shackles of religious theology, the part he drew was dull and lifeless; The angel painted by Da Vinci looked natural and lifelike. The two were in sharp contrast, and Verrozio sighed after seeing it. Da Vinci's mural "The Last Supper" is a world-famous painting. The content of the painting is: Jesus was informed by Judas, one of the disciples, and was about to be arrested, having a last dinner with 12 disciples (including the informant). There are many characters in the picture, but each has different looks; another world-famous painting is the Mona Lisa, which depicts the smile of a dignified and beautiful young woman. The young woman's eyes were like a smile from the heart, flashing on the paper. This painting is still collected in the Louvre in Paris, France, and is a treasure in the library of artists around the world. On May 2, 1519, Da Vinci died. He left more than 7000 pages of natural science manuscripts. Engels called him "not only a great painter, but also a mathematician, mechanic and engineer."