 Also on the ground level, the central arena is surrounded by a staging area where the bullfighters prepare and take refuge, called the "callejón" (alley).The "callejón" is separated from the arena by a wall or other structure, usually made of wood and roughly 140 cm high.The partition wall has doors for the entrance and exit of the bull ("puerta de los toriles") and human participants ("puerta de cuadrilla"), although the form, number, and placement of these doors will vary from one bullring to another.