MonaLisa, also known as the eternal smile, the Mona Lisa \x0d\ Da Vinci (Italian) oil painting (wooden board) is 77X53 in size. The Louvre \x0d\ Mona Lisa, the largest French art museum in the world, is a famous portrait masterpiece. It represents leonardo da vinci's highest artistic achievement and successfully shapes the image of bourgeois women in a city during the rise of capitalism. The figures in the painting sit gracefully, with implicit smiles and deep mountains and rivers as the background, vividly showing the painter's unique smoky "unbounded gradient coloring method"-like brushwork. The painter tried to skillfully combine the rich inner feelings of the characters with the beautiful shapes. For the key parts of the portrait face, such as the corners of the eyes, lips, etc., he also pays special attention to mastering the dialectical relationship between precision and implication, so as to achieve the charm, thus making Mona Lisa's smile have eternal mysterious charm, which is called "mysterious smile" by many art historians. Under the influence of humanism, Leonardo da Vinci focused on expressing people's feelings. In terms of composition, Leonardo da Vinci changed the habit of using a side bust or chest when painting portraits in the past and replaced it with a front bust. The perspective point rises slightly, making the composition pyramid-shaped, and the Mona Lisa looks more dignified and steady. In addition, Mona Lisa's hand, delicate, precise and plump, shows her tenderness, status and class status, and shows Leonardo's exquisite painting skills and his keen observation of nature. In addition, Mona Lisa's eyebrows disappeared due to chemical reaction, and blue sky appeared in the background. \x0d The Mona Lisa has been regarded as the most precious portrait for hundreds of years. In the 1960s, the valuation of this painting reached $654.38 billion. With the permission of the government, it was exhibited in 1962,1February 4 to1March 2, and 1963 in Washington, D.C. and new york, USA, which caused a sensation in the whole country. Many people came from other places to have a look. Due to too many visitors, it is said that the exhibition stipulates that each audience can only stay in front of the Mona Lisa for three seconds. Later, this painting was exhibited in Japan, which was more sensational than in the United States. It is said that each audience can only watch it for 2 seconds. 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". A university in Amsterdam, the Netherlands, used "emotion recognition software" to analyze the content and proportion of Mona Lisa's smile: 83% happy, 9% disgusted, 6% fearful and 2% angry. \x0d\ Mona Lisa, this is an endless question. It has been nearly 500 years since it came out, and later generations have many comments and speculations, leaving more and more puzzles. At present, there are hundreds of monographs on Mona Lisa in the world, and nearly 100 scholars regard this painting as a lifelong topic. The passage of time will not solve the puzzle, but will only leave more doubts for future generations with the deepening of research.