there is a world of sense that disappears when the light is off.

     “Painting with light” is jargon from the world of stage- 
electricity. The uses of light in the world of motion, whether in 
the motorcar or the movie or the microscope, are as diverse as 
the uses of electricity in the world of power. Light is 
information without “content,” much as the missile is a vehicle 
without the additions of wheel or highway. As the missile is a 
self-contained transportation system that consumes not only 
its fuel but its engine, so light is a self-contained 
communication system in which the medium is the message.

     The recent development of the laser ray has introduced 
new possibilities for light. The laser ray is an amplification of 
light by Intensified radiation. Concentration of radiant energy 
has made available some new properties in light. The laser ray—