impossibility of expressing colour in words with the consequent
need for some other mode of expression lies the opportunity of
the art of the future. In this art among innumerable rich and
varied combinations there is one which is founded on firm fact,
and that is as follows. The actual expression of colour can be
achieved simultaneously by several forms of art, each art playing
its separate part, and producing a whole which exceeds in
richness and force any expression attainable by one art alone.
The immense possibilities of depth and strength to be gained by
combination or by discord between the various arts can be easily
realized.

It is often said that admission of the possibility of one art
helping another amounts to a denial of the necessary differences
between the arts. This is, however, not the case. As has been
said, an absolutely similar inner appeal cannot be achieved by
two different arts. Even if it were possible the second version
would differ at least outwardly. But suppose this were not the
case, that is to say, suppose a repetition of the same appeal
exactly alike both outwardly and inwardly could be achieved by
different arts, such repetition would not be merely superfluous.
To begin with, different people find sympathy in different forms
of art (alike on the active and passive side among the creators
or the receivers of the appeal); but further and more important,
repetition of the same appeal thickens the spiritual atmosphere
which is necessary for the maturing of the finest feelings, in
the same way as the hot air of a greenhouse is necessary for the
ripening of certain fruit. An example of this is the case of the
individual who receives a powerful impression from constantly
repeated actions, thoughts or feelings, although if they came