Serocki's Stricture:
Marriage is always a bachelor's last option

Concept6 : Coordinate System
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Idea:
=====
In OpenGL the coordinate system is 
defined as follows

  o  The +ve X axis goes from left to right.
     
  o  The +ve Y axis goes from bottom to top.
     
  o  The Z axis is perpendicular to the screen 
     and is directed towards your eye.

Question
========
Where do you think the origin of this coordinate system
is?.  The obvious answer is wrong!! so watch out.
The answer to the above can be found in Concept7.