The kiva roof was supported by an ingenious framework of cribbed logs. As was mentioned above, six low stone pillars usually were constructed on the bench that encircled the kiva. Short logs were laid from pillar to pillar forming a circle of logs entirely around the room. A second circle of logs was placed on the first, with the logs cutting the angles in the first set. Another and another circle of logs was added—in the kiva pictured there were eight layers of logs altogether. As the circles rose they grew smaller and a dome effect was created. Finally logs were placed across the opening and a covering layer of adobe completed the roof. While this was an ingenious method, the roofs had a serious weakness. The entire weight of the roof rested on the first layer of logs. When one of these logs broke, the entire roof usually collapsed. As a result few of the kiva roofs are in place today. The one pictured is in Square Tower House.] [Illustration: No. 2. This kiva, which is in Cliff Palace, exhibits masonry of the highest quality. The smooth, sharp corners of the three pilasters, the true rectangular wall niches, the smooth plaster and the tamped adobe floor were the work of skilled craftsmen.] ARCHITECTURE—THE LIVING SPACE It is impossible to picture life in one of the large cliff dwellings unless the architectural unit shown below is taken into consideration. This small section of Spruce Tree House consists of a kiva partially surrounded by a group of rooms. This relationship of kiva and houses is so common in the larger caves that it must indicate deliberate planning on the part of the builders. In Spruce Tree House there are six of these kiva courts, almost identical to the one shown here. In each case the kiva with its flat open roof is partially or completely surrounded by houses. In considering the kiva court shown below it is quite possible that the houses were occupied by a group of closely related families, perhaps a small clan. In the high rear wall nine doorways can be seen. Each door opened into an individual room that had no side or rear doors. In these small, cell-like rooms the people slept and stored their possessions. The active life of the people from these houses was in the open court and on surrounding roofs. There was ample room for all and it was here that they cooked, ate, worked, and played. The overhanging cave roof sheltered the entire village from the elements and there was little need for the people to use the small dark rooms except at night. There was little privacy for individual families; probably all of the residents of this court area lived together like one very large family.