> I think it is 'levels' of nesting that are an issue

I've tried 1500 nested rhombododecahedrons: it works, but took
over 20 minutes of parsing time at 1 GHz because *all* objects
nested so far have to be transformed at every level, making the
time required for transformations proportional to the square of
the levels (when objects of comparable complexity at every level
are nested). 50 rhombododecahedrons take only 1 second, so very
complicated robot arms or even chains are easily possible with
the nesting method.

   Sputnik

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