Following comparisons with modern pueblos, there is every reason to suppose that the kivas preserve the oldest types of buildings of the cliff-dweller culture, and it is believed that the form of these archaic structures is a survival of antecedent conditions. They belonged to the men of different clans, as in a measure is the case among the Hopi at the present day, with whom every kiva is spoken of as that of a certain man who is a clan chief. The male and female members of every Hopi clan have affiliation with certain kivas (a survival of archaic conditions), and in certain clan gatherings, as the dramatic exhibition which occurs in March, the celebration takes place in their respective kivas. [Illustration: PLATE 21 STONE HATCHETS] As the kiva is the men's room, and as religious exercises are largely controlled by men, such ceremonies occur in kivas, which are practically the ceremonial rooms.[45] [Footnote 45: In certain ceremonies of Hopi women's societies the kiva has also come to be a meeting place for these sororities and where they erect their altars.] KIVAS OF THE FIRST TYPE All kivas of the first type are constructed on the same general plan, the different parts being somewhat modified by surrounding conditions. While their general form is circular or cylindrical, some are square with rounded angles, others oblong, and others more or less heart-shaped. Their diameter and height vary according to circumstances, but this type is always subterranean when possible, even though excavation in the rock may be necessary. The walls of the kivas are sometimes double, and the masonry is generally well constructed. The walls show evidences of plastering, which is decorated in some instances with paintings or incised figures. The number of pilasters is commonly 6, but 4 and 8 are also evident; rarely, as in kiva M (the subtype), all are missing. Between these pilasters are the so-called banquettes, one of which is usually larger than the others. The banquettes are generally built 3 or 4 feet in height, consequently they could scarcely have been intended for seats. The pilasters are commonly rectangular, sometimes square, the size being about uniform from base upward. In rare instances a pilaster has a cubby-hole[46] in one side. Where circumstances require the ventilator penetrates the rear portion of the pilaster, but the flue never enters the side of the kiva under a pilaster. [Footnote 46: These small holes, generally square, are usually found in the wall below the banquette.]