What is the "golden ratio" of human body?

1. The golden section theorem: It was discovered by the Pythagorean school in ancient Greece. It focuses on the law of beauty from the mathematical relationship, and holds that beauty is harmony and proportion. According to this proportional relationship, beautiful patterns can be formed. The golden section theorem is actually a proportional relationship of numbers, that is, a line is divided into two parts, and the ratio of long segment to short segment is equal to the ratio of total length to long segment. Their ratio is about 1.6 18: 1 or about 8:6. The human body also has a golden ratio. Especially in an ideal human body, the ratio of the lower half to the upper half is usually 8: 5. This relationship also exists in the head and face, that is, the distance from hairline to chin and from chin to lateral canthus, from chin to lateral canthus and from chin to nasal alar, from chin to cleft lip and from chin to nasal alar, the distance from face width to lateral canthus, and the width of cleft lip and nasal base. The so-called proportional theory is to use mathematical methods to represent the standard human body; And according to a certain benchmark, based on a certain part of the same human body, the method of formulating the proportional relationship between him and the human body is called the same body method. Leonardo thinks that an eight-headed figure (that is, the body length is eight times the height of the head) is an ideal figure for healthy young men and women by dividing the body into two equal sections with the highest points of the iliac bones on both sides as the boundary. 3. The law of facial five senses distribution proportion: (1) The distance from hairline to chin should be equal to the height of three ears or nose. That is, the distance from the hairline to the eyebrows is equal to the distance from the chin to the nose, and the height of the ears is equal. (2) As early as the 5th century, Leonardo de Vince divided the craniofacial region into two halves, with the upper half from the top of the skull to the nasal root and the lower half from the nasal root to the chin. The height of these two parts should be equal. At the same time, he thinks that the distance between two eyes is the width of one eye and the two outer edges of the nose. The corners of the mouth are just on the vertical lines of the inner edges of the two corneas, and the front face of the face can be vertically divided into four equal parts, that is, from the midline of the face and its left and right sides through the iris side edge and the face side angle. Some people divide the face into five eyes, that is, at the eye level, the distance between the left and right ear holes is exactly equal to the width of the five eyes. (3) The side edges of the eyebrows are slightly upward and outward, which makes them look young and energetic. Otherwise, it will be lifeless. In plan view, the edge of the upper eyelid is flush with the edge of the upper pupil, and the edge of the lower part is flush with the edge of the lower cornea, but it is not suitable for the elderly. 4. The theory of angle measurement is usually based on the straight line between the tip of the nose and the submental point, which can be used to observe the protruding degree of lips, thus evaluating beauty and ugliness. When the tip of the nose-lips-submental point is basically a straight line, it is considered beautiful.