I don't know if you have found an interesting phenomenon, the beautiful women in the ancient Chinese women's pictures are single eyelids, even if the painters at that time will slightly adjust the woman's posture, but their preference for single eyelids has always been the same. In fact, it is not just ancient painters who like single eyelids, but the ancients were basically single eyelids, and occasionally one or two double eyelids appeared, and they would feel strange. Modern people can't help but wonder: Are the Han people of the purest blood all single eyelids?
According to historical records, single eyelids are one of the characteristics of the Mongol race, and due to the large amount of fat above their upper eyelids, a fold will form to cover the upper eyelids. However, could it be that the ancient Han Chinese were of "pure" Mongol race? In fact, before the Qin and Han, the characteristics of the Han people can be seen from the excavated Qin figurines, the Qin figurines have a wide face, a flat nose, and each one has a pair of phoenix eyes with a single eyelid, which is a typical Mongolian race.
However, after the Jin Dynasty dongdu, the genes of the Han people could no longer be as "pure" as those of the Qin and Han dynasties. After experiencing the Wei and Jin Dynasties and the Wuhu Chaohua, most of the ethnic minorities that invaded the Central Plains were assimilated by the Han nationality, and the Han people who took refuge in the south assimilated the indigenous peoples in the south, and the integration for a long time caused the appearance of the Han and the ethnic minorities to gradually change from the original clear distinction to the later confusion.
It can be clearly seen from the Tang Dynasty murals and Tang Dynasty sculptures that the number of Hu people with convex noses and concave eyes accounts for a large proportion, and without exception, they are all double eyelids. However, it seems that double eyelids have not yet appeared in large numbers on the faces of han Chinese, but because most of those murals were unearthed in the north, because the north was the cultural center of China at that time, the nomadic peoples such as the Xiongnu and Xianbei, who were assimilated by the Han people, should not have been greatly affected.
However, in the Song Dynasty, China's cultural center migrated to the Yangtze River Valley, and the ethnic minorities in Southeast Asia gradually integrated into the Han Nationality. At the same time, the Khitans, Manchus and other ethnic minorities who invaded northern China were also assimilated by the Han Chinese. Later, since the Yuan Dynasty unified the whole country, the integration of the Northern Han nationality has become nearly complete, while the genetic structure of the Southern Han nationality has been basically fixed, and double eyelids have also appeared in a large number of Han groups.
In fact, whether it is a single eyelid or a double eyelid, it is the result of ethnic integration, even if the traditional single eyelid, it is likely that before the Qin and Han Dynasties, in which unknown era, due to the migration of ethnic groups, resulting in changes in the genetic structure of the eyelids of the Han people. Living in a country of 56 ethnic groups, everyone should abandon their racial views and live in solidarity and harmony, because everyone has a common name - Chinese.