[Illustration: Fig. 21—Interior view of a kiva showing distinctive features. Note the ventilator, deflector, fire-pit, sipapu, bench, and pilasters.] In addition to the houses, kivas, and dance courts, there were also brush shelters with firepits, ovens and storage places. These probably provided outdoor cooking facilities during the summer. In the field of pottery, important changes were taking place, and specialization was increasing all through the Anasazi area. Developmental-Pueblo pottery had a finer paste and was better made than that of Modified-Basketmaker times. Some tempering was done with pulverized potsherds. More different types were represented. Plain gray ware was still made. Pottery with black designs on a white background was very common, except in the Alkali Ridge[7] area of southeastern Utah where early Developmental-Pueblo painted pottery had a pinkish-orange ground color with designs in red paint. In referring to painted pottery it is customary to mention first the color of the design and then the color of the background, as, for example, _black-on-white_ or _red-on-orange_ ware. Minor types of Developmental-Pueblo times included a lustrous black-on-red ware and bowls with more or less polished black interiors and brownish or reddish exteriors. The differentiation between culinary and non-culinary pottery became more marked. The former came to be characterized by corrugations in the clay, and the latter chiefly by painted designs. [Illustration: Fig. 22—Corrugated Pottery. (Courtesy National Park Service.)] Specialization in particular areas is best shown in the black-on-white wares. There are two main groups—an eastern one which centered around the Chaco Canyon area of New Mexico, and a western one which centered around the Kayenta region of Arizona.[110] Both extended far beyond these nuclear areas. The former was characterized by a wide use of mineral paint. Designs stand out from the background. Possibly they were applied after the vessel had been polished. In the western form, designs were usually applied with a paint made from plant juices and they seem to fade into the surface of the vessel. This may be due in part to the application of paint before the polishing of the vessel had been completed.