Second Law of Business Meetings :  
If there are two possible ways to spell a person's name
you will pick the wrong one.

Concept4 : Background Color
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Idea:
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In OpenGL we define the background color of the window 
using the command glClearColor(x, y, z); where 
x, y and z are the color components blue, green, red (the
order is purposely specified incorrectly).

Experiment:
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Using the slider bar try different color values.

Exercise
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I haven't told you the order of the colors taken as 
arguements to the function glColor3f(). Try different 
color combinations and find out what x, y, and z 
stand for.

Try different equal portions of the primary colors and 
see how the color changes

Note:
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Window clearing won't occur just by setting values to 
glClearColor().  Make sure to make a call to 
glClear(GL_COLOR_BUFFER_BIT)  also.  

The color values are clmaped in the range [0,1].