A sine curve goes off to infinity or atleast the
end of the blackboard. - Prof. Steiner

Concept 4.2 : Material - Ambience
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Idea:
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GLfloat mat_amb[] = {red, green blue, alpha};
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, mat_amb);
specifies the ambient light reflected by an object.

Ambient reflectance affects the overall color of the
object.  Ambient reflectance is most noticeable where
an object receives no direct illumination.  An object's
total ambient reflectance is affected by the global 
ambient light and ambient light from individual sources.