Although the Fremcn sculptor was beset by taboos (which differed from region to region) regarding the representation of the human form, sculpture as a decorative art was developed to a high degree planet-wide. One method peculiar to the desert Fremen was "wind-etching." The process of wind-etching began with the collection of the scale insect Laccifera arctica, which lived on the twigs of certain plants native to the northern near-polar regions. The resin secreted by the insects was gathered and traded to the desert Fremen, who boiled it (distilling and saving the water vapor given off-waste not, want not) to produce a gumlike varnish. The sculptor spread the varnish in a thick layer on the surface of the stone to be etched, then scratched the design in the coated face with a flint scribing toot.