Brainstorm: What else can I borrow?

Interpretation and analysis: digging a wall to borrow light means that a person steals a hole in the wall and the light shines out of the hole, thus achieving the effect of "borrowing", so there is no need to return the light.

Extended data:

Cut the wall and borrow light from volume 2 of Xijing Miscellanies, which reads as follows:

Kuang Heng studied hard without a candle. His neighbor had a candle but didn't catch it. Balance is to send its light through the wall and read it with a book that reflects the light. City people can't read their surnames. They have money at home and many books. Therefore, Heng is cooperating with him, not claiming compensation. The master was surprised and asked Heng, who said, "May the master read all the books." The host sighed, gave books and became a university.

Kuang Heng is diligent and studious, but there are no candles at home. There are candles next door, but the light can't reach his house. Therefore, Kuang Heng dug a hole in the wall to attract the light from his neighbors, so that it could be read in a book. There is a large family in the county who know nothing about literature and have a lot of books.

Kuang Heng went to his house as an employee, but he didn't want to be paid. The host felt very strange and asked him why. He said, "I hope to read all the books of the host family." Hearing this, the master sighed deeply and used books to help Kuang Heng. So Kuang Heng became a great scholar.