Myth and legend theme. There are pictures of deer, cranes, turtles and other animals and figures on the mirror in the Song Dynasty, which belong to the myths and legends in the traditional culture of China. Specifically, deer and cranes have a high symbolic significance in China culture, and are regarded as auspicious symbols, while turtles are sacred animals in ancient China mythology, regarded as immortal symbols, and are often used to imply good luck and longevity.