What does bamboo slip calligraphy mean?

Before the invention of paper, bamboo slips were the main carrier of calligraphy ink. Therefore, during the long 600 years from the early years of the Warring States to the end of the Eastern Han Dynasty, bamboo slips calligraphy not only has a large number of excellent works for us to appreciate and learn from, but also is a very important link in the whole history of calligraphy development in China.