The treasure of the Louvre Museum in Paris, France: Leonardo da Vinci's Mona Lisa, alias "Gioconda", was one of the three famous Italian painters during the Italian Renaissance (1452- 15 19). Mona Lisa's smile was written around 1504. The Mona Lisa in the painting has become a symbolic image of aesthetics and philosophy, and has long been the object of imitation by Dadaism and surrealism painters. Portrait (4) For 500 years, people have been unable to agree on the mysterious smile of Mona Lisa. Different audiences or at different times look and feel different. I think she sometimes smiles comfortably and gently, sometimes looks serious, sometimes looks slightly sad, and sometimes even reveals ridicule and ridicule. In a painting, the change of light can't be as different as in sculpture. However, on Mona Lisa's face, dim shadows appear and disappear, covering her eyes and lips with a veil. However, people's smiles are mainly reflected in the corners of their eyes and corners of their mouths. But Leonardo da Vinci's descriptions of these parts are faint and have no clear boundaries, which is why there is such an elusive "mysterious smile". Dr. Livingstone, a neuroscientist at Harvard University, said that Mona Lisa's smile was flickering, which was related to the human visual system, rather than the mysterious expression of the people in the painting. Dr. Livingstone is an authority on visual nerve activity, mainly studying the response of eyes and brain to different contrast and light and shade. Livingstone said: "The smile is flashing because the viewer has changed the position of his eyes." She said that the human eye has two different parts to receive images. The central part (that is, the shallow fossa on the retina) is responsible for distinguishing colors and marking them carefully. Pay attention to the black and white, movements and shadows around the shallow pit. According to Livingstone, when people look at a face, most of their eyes are fixed on the other person's eyes. If people's central vision is placed in Mona Lisa's eyes, then less accurate peripheral vision will fall on her mouth. Because peripheral vision does not pay attention to nuances, it invisibly highlights the shadow of cheekbones. In this way, the radian of the smile is even greater. However, when the eyes look directly at Mona Lisa's mouth, the central vision will not see the shadow. Livingstone said, "If we look at her mouth, we will never catch her smile." Mona Lisa's smile is looming because people's eyes are constantly shifting. Livingstone pointed out that if you want to copy the Mona Lisa, you should look away when describing your mouth. After X-ray irradiation, it was found that the Mona Lisa's mouth was painted with 40 layers of paint, each of which was very thin. It is proved that this painting is not painted with pen and ink, but that the author painted the paint on his hand and then painted it on it. It takes several months for each layer of paint to dry completely, and it is estimated that it will take about 10 years to draw the Mona Lisa's smile. 1993, Susan Gill, a Canadian art historian, published a shocking research result. She said that Mona Lisa's lips, which attracted countless audiences, were men's bare backs. This argument is novel and absurd, but it is powerful. Leonardo da Vinci, a painter, sculptor, architect, engineer and scientist, was a "geek". He likes to wear a pink coat, paint his beard with colorful colors without scruple, and often claims that he has dissected more than 30 bodies. He is still left-handed and used to write backwards from right to left. Others must use the mirror to read what he wrote. Therefore, using the mirror is also a way for the audience to read pictures. After rotating 90 degrees, Mona Lisa's lips in the mirror are just the back of a strong man with clear lines, as well as his left arm and elbow angle; Besides, expressing the beauty of human body and calling for the awakening of human nature is not only the master's philosophy of life, but also his artistic view. Indeed, people will get different feelings when they appreciate this painting from different angles and under different light. That smile is sometimes gentle, sometimes serene and serious, sometimes slightly sad, and sometimes somewhat ironic and ridiculous. The mysterious smile reveals the mysterious spiritual activities of the characters. For hundreds of years, new explanations of "smile" have emerged one after another. For example, smiling without showing white teeth is because the prototype is elegant and beautiful but not good at words; The prototype is depressed and unhappy because of the death of his beloved daughter, and it is difficult to hide his sadness. What's more, Mona Lisa was pushed off the throne of a lady, and the prototype was demoted to a prostitute, so she smiled with ridicule and ridicule. Dr Joseph Baukowski of Maryland, USA, said: "The Mona Lisa didn't laugh at all. Her facial expression typically shows that she wants to hide that she has no front teeth. " Dr Jean Jacques Kondert, a brain surgeon in Lyon, France, thinks that Mona Lisa has just suffered a stroke. Look, half of her face is flabby and her face is crooked, so she looks smiling. Dr Kenneth gay friends, a British doctor, thinks the Mona Lisa is pregnant. His basis is that her face is satisfied, her skin is fresh and tender, and her hands are crossed on her abdomen. Sexologists speculate that Mona Lisa has just experienced an orgasm, so she showed a smile that fascinated the world. There is also an almost nonsense statement: her expression looks like she ate phenylalanine, a pleasure hormone produced in her body after eating chocolate. Few people believe this statement, because there were no chocolates and stimulants at that time. In the painting, the horizon on the left is lower than the right, and the left side of Mona Lisa looks bigger than the right side. Historically, the left side represents women, which shows Leonardo's worship of women. Computer analysis shows that Mona Lisa's face has many similarities with Leonardo da Vinci's self-portrait. Maybe Mona Lisa is Leonardo da Vinci herself. In Egyptian legend, the god in charge of male genitalia is called Amon, and the god in charge of female genitalia is called Isis-once pronounced L'ISA in ancient Chinese, so Mona Lisa implies that Mona Lisa is a fusion of the two sexes.