Rota (architecture)

The rota or "turn" is a cylinder on a vertical axis, open on one side, that is built inside a wall of a monastery, nunnery or foundling hospital.

[1] It was used for exchanging mail and food with cloistered clergy, being their only communication with the world.

Messages or food are put into the cylinder, then the rota is revolved so that the opening faces the other side.

Monks were stationed close by, or were notified by various mechanisms that the wheel had been turned.

In some cases, especially at night and in winter, the rota was filled by the monks with food for the poor, to give them something to eat without them having to ask.