108. A distinction must be drawn between the measures of the outline,
as an outline, and the measures of the space or area lying within the
outline: what may be called the interior dimensions of the outline.
[Illustration: Fig. 176]
In this case we must distinguish between the measures of the outline
and the dimensions of the space inclosed within it. When we consider
the measures—not of the outline, but of the space or area inside of the
outline—we may look in these measures, also, for Harmony, for Balance,
or for Rhythm, and for combinations of these principles.