Directly behind the large prayer hall is a smaller building that serves as the temple's ordination hall (Ubosot). This is where young monks are ordained and some other important religious events are held. The wooden building shelters a large brick and plaster altar, that I suspect pre-dates the outer building and was originally out in the open. The clues to this are the altar's shape and the fact that it sits in the middle of the building rather than at one end. The orientation of the entrances on a north - south axis rather than east - west is another clue.