What is the earliest and most common pattern in copper drums?

The sun pattern is the earliest and most common pattern in copper drums. It usually consists of a circle of sun rays, sometimes accompanied by elements such as clouds and thunderstorms, representing the power and mystery of nature. The appearance of the sun pattern reflects the ancient people's worship and reverence for the sun, as well as their observation and understanding of nature. In the copper drum culture, the sun pattern is not only a kind of decoration, but also a symbol of faith and culture.