The arc is arranged on the left (right) side of the door. What year is it today?
People have always had different views on the origin of birthday culture. As early as the pre-Qin Dynasty, it was recorded in the Book of Rites Internal Rules: "Zi Sheng: Men set the door arc on the left and women set the door arc on the right." The "arc" here refers to the bow, and the "Xun" refers to the handkerchief worn on the body, which means that when a child is born, a bow is hung on the left side of the door if it is a boy, and a handkerchief is hung on the right side of the door if it is a girl. Since then, every year on this day, people have to hold a banquet to celebrate, usually called "birthday".