Introduction to the cell: The cell is a three-bay civil structure hut. In the center are the night watchman's fire pit, bed, table, totem couplets symbolizing the God of Hell, and an incense burner. On the left is the place where felons are detained, with fences on four sides and doorways for prisoners to enter and exit. There are torture instruments in the room such as the foot cannon, the four-foot cannon, the fishtail cannon and the iron chain hand roaster.