「China」Four Treasures of the Study
子规声里雨如烟
The “Four Treasures of the Study” and Slowly both serve as tools for communication. In the past, brush（筆）, ink（墨）, paper（紙）, and inkstone（硯） allowed people to express their thoughts through calligraphy and letters. Today, a letter-writing app achieves the same purpose, but digitally.They reflect the importance of sharing personal thoughts, whether through traditional handwriting or modern technology.
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Caro1012
Yeah definitely those are really important treasures not only for China but also globally, especially the paper(紙). After Cai Lun improved paper making technology in the Eastern Han Dynasty, paper became cheap and efficient. As a carrier of words, paper greatly promoted the spread of ideas in the European Renaissance and the mass printing of the Bible later, which promoted the process of religious reform.