1, health and fertility. Survival and reproduction are the first instinct of animals, and human beings are no exception. Gender characteristics are obvious, and health and fertility are the first aesthetic elements.
2, visual inspection is average. Observing all kinds of looks from the first moment of birth, the average characteristics of all kinds of looks are the standard of beauty. Experiments have proved that tens of thousands of photos of ordinary people are combined and superimposed, and the result is beauty. Face shape, the average of the size ratio of each air organ, beautiful. I seldom met foreigners when I was a child. Occasionally meet someone who feels like a monster. Now that I have seen more, I don't feel so strange.
3. Environmental aesthetic influence, including times, races and regions. The fat beauty of the Tang Dynasty, the black beauty of Africa, the morbid beauty of Lin Daiyu, and the skinny beauty now will all guide our personal aesthetics.
In ancient times, most people were malnourished, so it is natural to pursue health with fullness as beauty. Nowadays, people are generally overnourished, and it is natural to pursue health with thinness as the beauty, just don't overdo it.