thick#:=1pt#;
stepwidth#:=designsize/8;
define_pixels(stepwidth);
define_blacker_pixels(thick);
picture save_pic;
numheights:=16;
numlengths:=8;%(12-96pt)

code=-1;
for j=1 upto numlengths:
  slength#:=j*12pt#;
  define_pixels(slength);

  for i=1 upto numheights:
    beginchar(incr code, slength#, 0, 0);
      x1=y1=0;x2=slength;y2=-i*stepwidth;
      penpos1(thick,90);
      penpos2(max(1,.15thick),min(2angle(z2-z1)+90,180));
      fill z1r{dir(1)}..{dir(min(2angle(z2-z1),90)-1)}z2r--
           z2l{dir(min(2angle(z2-z1)-180,-90))}..z1l{left}--cycle;
      save_pic:=currentpicture;
    endchar;

    beginchar(128+code, slength#, 0, 0);
      currentpicture:=save_pic reflectedabout((.5slength,0),(.5slength, 1));
    endchar;
  endfor

endfor
end