It is called a paperweight, which refers to something used to press down paper when writing and painting. The most common ones nowadays are rectangular, so it is also called a weight ruler or a pressure ruler. The original paperweights had no fixed shape. The origin of paperweights is that ancient literati often put small bronzes and jades on their desks to play with and appreciate them. Because they have a certain weight, people will also use their hands to press paper or books while admiring them. Over time, it developed into a stationery utensil - a paperweight.