The container box adds some surfaces that don't belong to the isosurface
itself (that is, the threshold at those extra surfaces is wrong). The
"open" keyword just removes those extra surfaces.
  I think that the idea behind those extra surfaces is that usually you
want a closed surface, not an open one. Open surfaces with interior are
not very intuitive (specially when used in CSG).

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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