When part of a monastery, the chapter house is generally located on the eastern wing of the cloister, which is next to the church. Since many cathedrals in England were originally monastic foundations, this is a common arrangement there also. Elsewhere it may be a separate building. The chapter house comprises a large space, in order to hold all the monks of the monastery, and is often highly ornamented. Typically there is seating around, often built into, all the walls of the room, often in stone, with the central space left open. The seats for the senior members are often larger than the others, and may be raised on a dais. Usually there is only one doorway, and though the room is well-lit where the location allows, the windows are often too high to allow a view in from outside (or eavesdropping). Many larger chapter houses are designed with vestibules for attendants and those waiting to be called, where opening onto a cloister does not provide such a space. There is often a fireplace, and altars are found in some examples, sometimes added later.