requirements of various
occasions. A decorative scheme in which light and medium grays are
employed produces an interior which is very sensitive to lighting
effects. To these light-and-shade effects colored light may add its
charming effectiveness. Not only are colored lighting effects able to
add much to the beauty of the setting but they possess certain other
powers. Blue tints produce a "cold" effect and the yellow and orange
tints a "warm" effect. For example, a room will appear cooler in the
summer when illuminated by means of bluish light and a practical
application of this effect is in the theater which must attract
audiences in the summer. How tinted illuminants fit the spirit of an
occasion or the mood of a room may be fully appreciated only through
experiments, but these are so effective that the future of lighting will
witness the application of the idea of "painting with light" to its
fullest extent. Color is demanded in other fields, and, considering its
effectiveness and superiority in lighting, it will certainly be demanded
in lighting when its potentiality becomes appreciated and readily
utilized.

The expressiveness of light is always evident in a landscape. On a sunny
day the mood of a scene varies throughout the day and it grows more
enticing and agreeable as the shadows lengthen toward evening. The
artist in painting a desert scene employs short harsh shadows if he
desires to suggest the excessive heat. These shadows suggest the
relentless noonday sun. The overcast sky is universally depressing and
it has been found that on a sunny day most persons experience a slight
depression when a cloud obscures the sun. Nature's lighting varies from
moment to moment, from day to day, and from season to season. It
presents the extremes of variation in distributions of light from
overcast to sunny days and in the latter cases the shadows are
continually shifting with the sun's altitude. They are harshest at noon
and gradually fade as they lengthen, until at sunset they disappear. The
colors of sunlit surfaces and of shadows vary from sunrise to sunset.
These are the fundamental variations in the lighting, but in the various
scenes the lighting effects are further modified by clouds and by local
conditions or environment. The vast outdoors provides a fruitful field
for the study of the expressiveness of light.

Having become convinced of this power of light, the lighting expert may
turn to artificial light, whi