How about adding support for variables, conditionals (if) and loops (while)
to functions (used in isosurfaces, pigments...)?
  This would enhance a lot the possibilities of the functions. It would allow,
for example, making a Mandelbrot pattern function.

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

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