zones, checkers, and the like. It is to be expected, however, that the
normal ornament of this class of products should be greatly interfered
with through attempts to introduce extraneous elements, for the
peoples have advanced to a stage of culture at which it is usual to
attempt the introduction of mythologic representations into all art.
Further consideration of this subject will be necessary in the next
section of this paper.

[Illustration: FIG. 327. Coiled tray with geometric devices, probably
modified by ideographic association. Moki work--1/4.]

[Illustration: FIG. 328. Tray of interlaced style of weaving, showing
geometric ornament, probably modified by ideographic association. Moki
work--1/4.]

The processes of pure geometric elaboration with which this section is
mainly concerned can be studied to best advantage in more primitive
forms of art.

[Illustration: FIG. 329. Tray of interlaced style of weaving, showing
geometric ornament, probably modified by ideographic association. Moki
work--1/4.]

_Non-essential constructive features._--Now, all the varied effects of
color and design described in the preceding paragraphs are obtained
without seriously modifying the simple necessary construction, without
resorting to the multiple extraordinary devices within easy reach. The
development and utilization of the latter class of resources must now
receive attention. In the preceding examples, when it was desired to
begin a figure in color the normal ground filament was dropped out and