"Heart" is a pattern, which originated from the word "heart" in China Oracle Bone Inscriptions. The heart-shaped symbol consists of two semi-circular protruding parts, the upper part is concave and the lower part is pointed. Heart-shaped symbols are usually represented in red. Heart-shaped symbols are used to represent "love". For example, "I love you" means "I love you". The red heart symbol (red heart) is also one of the colors of playing cards.
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Origin history of heart-shaped symbols:
Is to express people's beautiful feelings. As early as in ancient Greece, people used hearts to represent the leaves of some plants. In the 4th century BC, Etruscan civilization used heart-shaped ivy leaves to symbolize fertility, loyalty and rebirth. Buddhism uses the heart-shaped symbol to represent the fig leaf, which means enlightenment. In the 2nd century, this symbol was used as a symbol of Mongolian Scotch pine herb for contraception in Cyrene.
Although it is generally believed that the heart-shaped symbol originated from the heart in modern times, it is not clear when it was first used to represent the heart. One theory is that it comes from the description of human heart in the works of ancient Greek doctor Galen.
Galen studied the human body by dissecting gladiators. He painted his heart like a pine cone or an inverted leaf. From then on, until the Middle Ages, Galen's description of the heart was generally accepted as an authority because of the religious prohibition of anatomy.
The earliest known expression of using the heart is in a French love story Romandelapoire in 1250. After the Renaissance, anatomy has made great progress. The inverted heart described before has also become orthomorphic, becoming the symbol of the heart we see now. With the popularity of playing cards, the heart-shaped symbol representing the heart has become more popular.
How did the shape of "love" evolve? 1. Some people think that the origin of heart-shaped patterns is related to the ancient plant Pinus sylvestris var. mongolica.
This is a fennel plant, which grows on the coast of the Greek colony of Cyrene in North Africa. The Greeks and Romans used it as a condiment, a contraceptive and so on. Many ancient writers have mentioned its protective function. According to some ancient articles, the seeds of Pinus sylvestris var. mongolica are heart-shaped.
2. The works of Italian painter Giotto
In addition, there are also views that the heart-shaped pattern comes from the shape of ivy or water lily leaves. Some people even think that it is designed according to human body parts such as breasts or buttocks.
The earliest recorded heart-shaped pattern appeared in a French manuscript RomanceofthePear in 13. The manuscript depicts a woman and her suitor, kneeling on the ground, holding his heart in her hand. The heart looks like a pine cone, upside down (different from the current heart-shaped pattern).
Researchers think this is a heart-shaped pattern because the part held in the hand is invisible. However, because the name of the manuscript is "RomanceofthePear", the suitor may just hold a pear.
3. The heart-shaped pattern on the manuscript "RomanceofthePear"
There is also a view that the heart-shaped pattern is based on Aristotle and the ancient Greek famous doctor Galen. Aristotle and Galen believe that the heart has three ventricles, with a depression in the middle. Martin Kemp, a retired professor at Oxford University, and others believe that medieval scientists tried to draw the shape of the heart according to their descriptions.
/kloc-the heart painted by Italian doctors in the 0/4th century is very similar to Aristotle's description. Because the heart is considered to be related to human emotions and emotions, the heart-shaped pattern has gradually become the representative of emotions.
There are many heart-shaped patterns in medieval artworks. Giotto, an Italian painter, depicts a woman in her painting 1305, who is dedicating her heart to Jesus in the church of Skolavini. The heart in the picture is similar to the shape of a pine cone, and it is upside down. Since Giotto, heart-shaped patterns have appeared in many works.
At the end of 14, the heart-shaped pattern was always upside down, and this tradition did not change until the beginning of 15. Another major change took place during this period, so the heart-shaped pattern became what it is today.
4. 19 heart-shaped cards from 1970s
Later, the depressions in the heart-shaped pattern began to appear. At first, the concave place was small, but later it became bigger and bigger. In the late15th century, the red heart-shaped pattern with depressions has become a very common symbol, even appearing on playing cards.
By the19th century, heart-shaped patterns have widely appeared on Valentine's Day cards, sugar cans and other items, and become an indispensable part of people's daily communication.
How is the heart line drawn? X2+y2-|x|y= 1 The image point is: the way of showing love by mathematical figures.
Descartes was born in France on 1596. When the Black Death broke out in continental Europe, he wandered to Sweden, met Princess Christina, who was 18 years old from a small principality in Sweden, and later became her math teacher. Getting along with each other every day makes them fall in love.
The princess's father, the king, flew into a rage and ordered Descartes to be executed. Later, she was exiled to France because of her daughter's intercession, and Princess Christine was also under house arrest by her father. Descartes contracted the Black Death shortly after he returned to France. He writes to the princess every day. Because she was intercepted by the king, Christine never heard from Descartes again.
Descartes died after sending the 13 letter to Christine. The letter 13 only contains a short formula: r=a( 1-sinθ). The king couldn't understand that they didn't always talk about love, so he gave this letter to Christine, who had been depressed. As soon as the princess saw it, she immediately understood the intention of her lover.
She immediately set out to draw a graph of the equation. She was very happy when she saw this number. She knows that her lover still loves her. It turns out that the graph of the equation is a heart. The princess established a polar coordinate system on paper, drew the points of the equation on it with a pen, saw the heart line represented by the equation, and understood Descartes' deep love for herself. This is also the famous "heart line".