[Footnote 1: The eight cubes in A, Figure 14, are as follows:
abb'd'c'c; ABB'D'C'C; abdDCA; a'b'd'D'C'A'; abb'B'A'A; cdd'D'C'C;
bb'd'D'DB; aa'c'C'CA.]

[Footnote 2: The sixteen cells of the hexadehahedroid are as follows:
ABCD: A'B'C'D': AB'C'D': A'BCD: AB'CD: A'BC'D: ABC'D: A'B'CD': ABCD':
A'B'C'D: ABC'D': A'B'CD: A'BC'D: AB'CD': A'BCD': AB'C'D.]




HARNESSING THE RAINBOW


Reference was made in an antecedent essay to an art of light--of
mobile color--an abstract language of thought and emotion which should
speak to consciousness through the eye, as music speaks through the
ear. This is an art unborn, though quickening in the womb of the
future. The things that reflect light have been organized æsthetically
into the arts of architecture, painting, and sculpture, but light
itself has never been thus organized.

And yet the scientific development and control of light has reached a
stage which makes this new art possible. It awaits only the advent of
the creative artist. The manipulation of light is now in the hands
of the illuminating engineers and its exploitation (in other than
necessary ways) in the hands of the advertisers.

Some results of their collaboration are seen in the sky signs of upper