a physicist is an atom's way of knowing about atoms
- George Wald

Concept 3.4 : Specular Lighting
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Idea:
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Specular light comes from a particular direction,
and it tends to bounce off the surface in a very
preferred direction.  A well-collimated laser beam
bouncing off a high-quality mirror produces almost
100 percent specular reflection.  

Experiment:
===========
Try setting the individual red, green and blue components
to 1.0, one at a time and see the effects.  Typically
specular settings are red = green = blue = 1.0 or 0.5
Use:
GLfloat light_specular[] = {R, G, B, A};
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
to set the specular component of light0.