Involution: a state in which people consume each other in competition, similar to the theater effect. In the theater, one person stands up, and others have to stand higher to see the performance. As a result, everyone stood up, but they could not see clearly. For example, 10 people compete for 1 position, and everyone works hard. As a result, everyone was very tired, but only got 1 person. This admitted person is called "the king of the examination paper", that is, the winner of the examination paper.