100 find the name and meaning of this drawing.

The composition of this painting consists of a circle, a square and a naked man: the sideline at the bottom of the square is tangent to the circumference, and the tangent point is exactly the midpoint of this sideline; The human body lies supine in the overlapping range of a circle and a square, the vertex of the head is tangent to the upper edge of the square, and the tangent point is just the midpoint of the edge; Feet together at the tangent point between the circle and the lower edge of the square, torso perpendicular to the upper and lower edges of the square, hands horizontally extended 180 degrees, and fingertips of both hands just reach the left and right edges of the square and are perpendicular to it. On this basis, the human body presents a second posture in the picture, with feet separated and soles intersecting with circles; Hands up to the intersection of the upper edge of the square and the circumference, just as high as the top of the head. The whole human body, whether in the first posture or the second posture, the circle and the square are very symmetrical.

People attach importance to the symmetry and harmony of this painting. For many years, the basic composition of this painting has been regarded as a symbol and decoration of modern pop culture, and it has been widely used in various posters, mouse pads, T-shirts and so on.

In fact, showing the symmetrical beauty of the human body is not the whole intention of this painting. Careful people will also find that in addition to the outline of the human body, some tangents are drawn on the trunk and limbs. These tangents are drawn in key parts of human body: the tangents of trunk are between knee joint, genital root, chest (tangents intersect with two nipples) and shoulders. In the posture of horizontal extension of hands, tangents are also drawn on the wrists, elbows and shoulder joints of both hands. These tangents are the dividing lines of human body structure, which are used to explain some regularity of human body structure.

In the blank space above and below the picture, there are annotation words written by Da Vinci himself. These words are the key to understanding this painting. However, in the past 100 years, these words have not attracted enough attention from China art historians. In many western art works, including the History of Western Art, there is no mention of these explanatory words, and when this painting was published, the words on the top and bottom of the picture were trimmed so that readers could not see the words.

Leonardo da Vinci's description in this painting is as follows:

..... Architect Vitruwe said in his works on architecture that the natural size of human body is allocated according to the following principles: 4 fingers are one palm, 4 palms are one foot, 6 palms are one wrist, and 4 wrists are one person's height. This measurement method can be used in buildings. If you stretch your legs and raise your arms until your middle finger is as high as your head, you will find that your outstretched limbs are centered on your navel and the space between your legs will be an equilateral triangle. The length from the hair root to the chin is equal to one-eighth of the height; The distance from the top of the chest to the top of the head is one sixth of a person's height, and the distance from the nipple to the top of the head is equal to the width of the shoulder and one quarter of a person's height; The length from elbow to armpit is one eighth of human height, and the length from elbow to fingertip is one fifth of human height. The starting point of genitalia is the midpoint of human body. The distance from the sole of the foot to below the knee is equal to the distance from the starting point of genitals to below the knee, which is a quarter of a person's height. The distance from chin to nose and from hair root to eyebrows is equal to one third of the length of ears and face. ...

I suggest you read dan brown's novel The Da Vinci Code.