I'm trying to set up some "modular" code in INC's where I want to have
the option of having "null objects."  (The application is a body where I
don't have to say define all the finger objects all the time;  I want to
have say one object that is all the approprate cylinders, another which
is just a few boxes.  One INC will define the motion, with modular INC's
for various "bodies".).

What is the best way for me to do this?

Ideally, I could say:
#declare fingerobject123= object{null}

If I cannot, what is the next best "null object" to use, especially if I
don't want it to mess with the bounding box or trace functions or other
properties of the collection of the objects?  Would it be along the
lines of

#declare fingerobject123= sphere {0,1e-10 pigment rgbft 1} ?

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