A brief answer is that the three acres of land in the south refers to cattle, which comes from the story of the cowherd and the weaver girl. Cowherd and Vega are mythical figures, which are derived from the star names of Cowherd and Vega. They are metaphors for couples living apart from each other, and also refer to a pair of lovers.
Cowherd and Weaver Girl, a famous folk love story of the Han nationality in ancient China, is also one of the four major folklore stories in China (the other three are Liang Zhu, Meng Jiangnu crying at the Great Wall and the legend of the white snake), which comes from the star names of Cowherd and Vega.
According to legend, the cowherd is an orphan and relies on an old cow to cultivate one's morality. This old cow is very psychic. One day, the weaver girl and fairies came to the world and took a bath in the river. The old cow persuaded the cowherd to take the fairy's clothes so that she could not go back to heaven. Later, the Weaver Girl became the wife of the Cowherd. They gave birth to a son and a daughter and lived a happy life. When the Queen Mother escorted the Weaver Maid back to heaven on the orders of the Heaven Emperor, the old cow touched the corner of the decapitated head, turned it into a boat, and let the Cowherd catch up with his children by boat. The heavenly queen drew a galaxy with golden hairpin, so that they could only cry across the river. Their love touched magpies, and countless magpies crossed the Tianhe River to build a magpie bridge for them to meet.
The Cowherd and the Weaver Girl can only meet on July 7th every year, and they will turn into the Cowherd and the Vega on weekdays. Since the Cowherd and the Weaver Girl went to heaven, the old cow can only stay alone in the world. The cow in the picture has become a little gloomy because of the departure of the cowherd and the weaver girl, and the broken horn on that head has just grown.
The broken horn of the old cow is getting longer and longer, but one horn with a serious broken horn is still a little incomplete. It closes its eyes and still seems to feel pain for the sad love of the Cowherd and the Weaver Girl. Li Qingzhao once wrote for the love of the cowherd and the weaver girl: "The grass is singing, the phoenix tree is shocked, and the world is sad." Yuntai moon and earth, locked a thousand times. You come and I go, don't meet. I haven't seen you for years, but I want to leave my feelings and don't hate being poor. Penny Weaver, this is just separation. The weather is sunny, rainy and windy. "As a workhorse who lived with Cowherd since childhood, isn't it a portrayal of Cowherd's feelings?
Tanabata is the day when cowherd and weaver girl meet. The earth cow looked up at the Milky Way, her eyes blurred. I wonder if she has seen Niu Ge and Niu Sao? Du Fu said in his poem: Petunia is in Hexi and Weaver is in Hedong. Always look at each other, whoever looks at Tanabata is the same. Alas, after this night, the old cow and her brother and sister-in-law will still be "inhuman, but far away from the sad place."