The image is a text-based explanation of the bronze sun-wheel, which was cast applying a two-step casting technique. The text is written in Chinese characters and is displayed on a green background. The explanation explains that the bronze cast was composed of five equal arcs and five spokes symbolizing rays of sunlight. The first cast, then the sun was cast onto the five rays, and then the final operation was joining them by soldering on the rear of the object. Joining holes were made in the center of the sun and at the ends of each arc of the halo. Among the fragments of sun-wheels unearthed at Sanxingdu, six objects can be identified, which all have a diameter of about 85 cm. It is reckoned that the sun wheel is a common ritual implement used by the ancient Shu people in the temples.