example from SunDew manual, corrected

clippath pathbbox newpath
2 div exch 2 div exch translate
250 250 scale 90 rotate
25 { 0 .9 moveto 0 0 1 90 -90 arc
   0 0 .9 -90 90 arcn fill
   .88 .88 scale 22.5 rotate } repeat
showpage