Fig. 9. Triangle ornament.
The triangles may be placed in a row, united in hourglass forms, or distributed in other ways. These triangles may be equilateral or one of the angles may be very acute. Although the possibilities of triangle combinations are almost innumerable the different forms can be readily recognized. The dot is a common form of decoration, and parallel lines also are much used. Many bowls are decorated with hachure, and with line ornaments mostly rectilinear.
The volute plays a part, although not a conspicuous one, in Spruce-tree House pottery decoration. Simple volutes are of two kinds, one in which the figure-coils follow the direction of the hands of the clock (dextral); the other, in which they take an opposite direction (sinistral). The outer end of the volute may terminate in a triangle or other figure, which may be notched, serrated, or otherwise modified. A compound sinistral volute is one which is sinistral until it reaches the center, when it turns into a dextral volute extending to the periphery. The compound dextral volute is exactly the reverse of the last-mentioned, starting as dextral and ending as sinistral. If, as frequently happens, there is a break in the lines at the middle, the figure may be called a broken compound volute. Two volutes having different axes are known as a composite volute, sinistral or dextral as the case may be.
Fig. 10. Meander.
The meander (fig. 10) is also important in Spruce-tree House or Mesa Verde pottery decoration. The form of meander homologous to the volute may be classified in the same terms as the volute, into (1) simple sinistral meander; (2) simple dextral meander; (3) compound sinistral meander; (4) compound dextral meander; and (5) composite meander. These meanders, like the volutes, may be accompanied by parallel lines or by rows of dots enlarged, serrated, notched, or otherwise modified.
In some beautiful specimens a form of hachure, or combination of many parallel lines with spirals and meanders, is introduced in a very effective way. This kind of decoration is very rare on old Hopi (Sikyatki) pottery, but is common on late Zuñi and Hano ceramics, both of which are probably derived from the Rio Grande region.
Lines, straight or zigzag, constitute important elements in Spruce-tree House pottery decoration. These may be either parallel, or crossed so as to form reticulated areas.
Along these lines rows of dots or of triangular enlargements may be introduced. The latter may be simply serrations, dentations, or triangles of considerable size, sometimes bent over, resembling pointed bands.