The image is a photograph of a plaque on a wall. The plaque is rectangular in shape and has a white background with black text. The text is written in Chinese characters and is in a traditional font. Below the text, there is a subtitle that reads "The ironware unearthed from the tombs of the Guo State are classified into two types by the experts in metallurgy history, artificial ironsmith and meteorite iron objects. They were used together for hundreds of years, which is the common character of all the countries with remarkable ancient civilization in the world. The discovery of the tomb of the Gao State offers a persuasive evidence. The appearance of the artificial ironstone in the tomb is made up of two centuries earlier than that of the previous, which reflects the advanced science and technology and the productive level of the Chinese state.