 geometry that one needs for a real application, then there are
a few futher questions that one needs to ask before one can get to work
on anything practical.  That is the point to which I have been down for
a while now, and if others are happy to remain at the phase of general
vaguity, then I will be happy for them, but must get moseying along.

SS: ... it seems to me that POVs are distinct from the generalized triad, O-S-I,
    which is movable from one to another POV, and so this triad is either just an
