The illegal we do immediately.  The unconstitutional
takes a bit longer.  - Henry Kissinger

Concept 1.10: The Scaling Transformation
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Idea:
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The scaling transformation glScalef(p, q, r) multiplies 
stretches, shrinks or reflects an object along the axes
by factors p, q, r.

Experiment:
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Try different values for the scaling factors.  Also
try the following value x = 1, y = -1, z = 1.  What
happens and why?

Answer:
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Scaling with a -1.0 vlaue reflects an object across an
axis.