When the deceased is well-to-do this observance may follow immediately, but usually years go by and many liaoes are served at the same time. On the great occasion the coffin is put on a big fire for a couple of hours until the flesh has been burned from the bones, which are then collected in a small box and placed in a house of limited proportions especially constructed for this purpose and called sandung. It is made of ironwood, and in these regions the people have a preference for placing it high above the ground, but it may also be put underground in a subterranean chamber also made of ironwood, which may take five or six months to construct and which is large enough to accommodate a family. The feast lasts one week, during which food and tuak are provided. Every night the women dance inside the house, around a tree composed of many bamboo stalks placed together so as to form a large trunk. As elsewhere mentioned, (Chapter XIV), the dancing, which is similar to that which follows the harvest, is for the benefit of the ghost and is distinct from the usual performance. As soon as the tiwah feast has been decided upon the people start simultaneously to perfect the various arrangements, some looking for a water-buffalo or two, others beginning to make the several contrivances which the occasion demands. Many men are thus occupied for several months. There are experts in the required handiwork, though a skilful man may be capable of performing all the various tasks. In earlier days the different memorials and the box containing the bones were placed in front of the house of the deceased, but of late years government officials have made some changes in this arrangement. When preparing for a tiwah feast it was the custom to close the river for perhaps three months by suspending a rattan rope on which were hung many spears of wood, tail feathers of the great hornbill, and leaves of certain trees. After a head had been secured the impediment was removed, but the government has forbidden the temporary obstruction. A most important matter is the construction of the device to which the water-buffalo, formerly the slave, is tied when sacrificed. In its make-up it expresses symbolically the rules of behaviour for the widow until after the feast has been celebrated. Its name is panyanggaran, an obscure word which probably may be derived from sangar, which means to kill; the place of killing.