The First Rule of Program Optimization:
        Don't do it.

Concept 1.3 : Translating Multiple Objects
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Idea:
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We can use glTranslatef(x, y, z) to translate
different object in space.  We do this by 
calling the function just prior to rendering
the objects.

Experiment
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We first render a cube without any translation
(i.e. render at the orign). The sphere is 
rendered after translating 3 units along the
x direction.  Try this:

  o  Change the values of x2, y2, z2 for the
     sphere.  You should see the sphere get
     rendered at a new position.  The cube remains
     at the origin.
  o  Now change values of x1, y1, z1.  The cube
     occupies a new position.  So does the sphere!
     It seems to have moved along with the cube
     even though we did not change x2, y2, z2.
     Why do you think this happened?  We will answer
     this in Concept1d.