Although considered an ancient art form, Puebloan pottery styles are not static. Potters have continually experimented and borrowed to vary their forms and designs. Turn-of-the-century Acoma potters created water jars which differed from their mid-nineteenth century precursors (photo) by having a shorter neck and under-body and the greatest diameter above the mid-line of the vessel. Field photo: Bernard Lopez, in L. Frank and F. Harlow, Historic Pottery of the Pueblo Indians, 1600-1800, 1974