This cultural relic is a copper musical instrument called the "Chinese Bronze Bell", made from the late 6th century BC to the early 5th century BC, and is now collected at the Minneapolis Museum of Art in the United States. The shape of this bell is called "xi", which is one of the two common bell shapes found in tombs of the Eastern Zhou Dynasty. The "Liu" clock has a flat bottom, slightly convex sides, and a decorative hanging device at the top, usually featuring stylized animal images that can emit a single tone. The decoration of this clock is very rich. There are 36 evenly distributed protrusions on the clock body, shaped like coiled snakes. The suspension device is a pair of tigers wrapped around a snake.