Without testing this (I have a large slow render running at the moment),
I hereby add another
plausible method to generate shadows without an apparent casting object:

    difference{
        object{MyGhostCaster}
        sphere{<0,0,0>,10 no_shadow}  /*chosen to contain the GhostCaster*/
              }

    If this works as I think it will, the sphere will completely annihilate
the object, but
be omitted from shadow calculations...  Anybody want to confirm this?

    -Robert Dawson

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