162. By Tone-Harmony I mean a relation of likeness in tones. Tones
are in Harmony when they resemble one another in all or in certain
respects. To be in Harmony two or more tones must have at least
something in common, either value or color. If they have the same
color they may be in the same degree of intensity, giving a Harmony
of Intensities. Tone-Harmony resolves itself into Value-Harmony,
Color-Harmony, and the Harmony of Intensities. The Harmony of
Intensities lies between tones of the same color, when they are
equally neutralized or neutralized in approximately the same degree.
When different colors are neutralized we have the Harmony of a common
neutrality or grayness of color.
163. Tones may be harmonized on the palette before they are used, that
is to say, before any positions, measures, and shapes are given to
them on paper or canvas, or they may be harmonized after positions,
measures, and shapes have been given to them. To harmonize tones on
the palette, as to value, we must bring them approximately to the same
value, with as little change of color as possible. To harmonize tones
on the palette as to color we must bring them approximately to the same
color, with as little change of value as possible. If two or more tones
have the same color they may be intensified or neutralized until they
are brought approximately to the same degree of intensity. The tones of
Red showing a Harmony of Intensities would lie on a vertical line drawn
through the triangle of Red in the Diagram of the Triangles.
As the tone-effect which we produce depends very largely upon the
positions, measures, and shapes which we give to our tones, we may not
be satisfied with an effect which has been produced with previously
prepared and harmonized tones. We may wish to change the effect,
to achieve a still greater Harmony. Given a certain arrangement or
composition of tones, certain tones in certain positions, measures, and
shapes, and given the problem to harmonize those tones, what do we do?