Tom Melly wrote:

>The thing to understand is that when you scale an object, the only point of that
>object that will stay still is the point at <0,0,0> (if it has a point in that
>position) - all other points will move.
>

This happens because POV scales objects by multiplying all points in an 
object by the specified scaling factor.  In the example Tom gave (which 
I edited out), the sphere at 2*x will move to 4*x, as well as doubling 
in size.  It will not move along any of the other axies, because 
0*anything = 0.  This is the same reason that an object at the origin 
will remain at the origin.

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