This is I think the earliest form of the terrace.

[Illustration: FIG. 495.--Section illustrating evolution of flat roof
and terrace]

It is therefore not surprising that the flat roof of to-day is named
_té k‘os kwïn ne_, from _te_, space, region, extension, _k‘os kwi e_,
to cut off in the sense of closing or shutting in from one side, and
_kwïn ne_, place of. Nor is it remarkable that no type of ruin in the
Southwest _seems_ to connect these first terraced towns with the later
not only terraced but also literally cellular buildings, which must be
regarded nevertheless as developed from them. The reason for this will
become evident on further examination.

[Illustration: FIG. 496.--Perspective view of a typical solitary
house.]

[Illustration: FIG. 497.--Plan of a typical solitary house.]

The modern name for house is _k‘iá kwïn ne_, from _k‘iá we_, water,
and _kwin ne_, place of, literally "watering place;" which is evidence
that the first properly so called houses known to the Pueblos were
solitary and built near springs, pools, streams, or well-places. The
universal occurrence of the vestiges of single houses throughout the
less forbidding tracts of the Pueblo country (see Figs. 496 and 497)
leads to this inference and to the supposition that the necessity for
protection being at last overcome, the denizens of the lava-fields,
where planting was well-nigh impossible, descended, building wherever
conditions favored the horticulture which gradually came to be their
chief means of support. As irrigation was not known until long