It may also cause problems if you use it in odd places, like:
sphere { <1,2,3>, # a = 1 2 pigment { rgb 1 } }
You may think that it's an unrealistic example, but it isn't.
One word: Macros.
--
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/
