What does Four Treasures of the Study mean?

Four kinds of stationery in China culture. Four Treasures of the Study refers to four kinds of stationery in China traditional culture, namely pen, ink, paper and inkstone. It is a necessary item in the study of ancient Chinese literati, and is known as the "Four Treasures of the Study". Among them, the pen refers to the writing brush, which is the main tool of China's calligraphy and painting, the ink refers to the ink for writing and painting, the paper refers to Xuan paper, which is the traditional paper for writing and painting in China, and the inkstone refers to the inkstone for grinding and holding ink.