Ghosts building a wall

In Chinese folklore, ghosts building a wall (simplified Chinese: 鬼打墙; traditional Chinese: 鬼打牆; pinyin: Guǐ dǎ qiáng; lit. 'ghosts beating the wall') refers to ghosts using some means to trap people in a certain area at night without being able to leave, so named because it is similar to building a wall to trap people.