Borrowing. Silk, stringed instrument; Bamboo, wind instrument. Silk and bamboo are used to refer to music.

It belongs to the tool generation ontology in borrowing.

For example: By the time of the Jingzhe plowing season, eight out of ten households had already uncovered the bottom of their hoards and were unable to open the pot. ("Yu Qian Rice")

"Hoard" is a tool for storing food, and "the bottom of the hoard is bright" refers to the lack of food; "pot" is a tool for cooking, and "the pot cannot be opened" refers to No food to eat.