fractal {

   // Establish the mapping between complex coordinates
   // and display coordinates

   mapping {
      (-0.10105470163733754063,
       0.14115032714089981170,
       0.53444305162959770961,
       0.79359468716161996049) => (800, 600)
   }


   // Set up our colors - a smooth gradient from a shade of blue, to
   // white then back to the original shade of blue.  Our gradient
   // spans 361 colors so that the value at 0 is the same as the
   // value at 360

   colors {
      define {
         gradient(330) {
            [255 255 204]
            [204 153 0]
            [255 255 204]
         }
      }
     define {
         gradient(330) {
            [204 255 204]
            [0 51 0]
            [204 255 204]
         }
      }
   define {
         gradient(330) {
            [204 255 255] 
            [0 51 51]
            [204 255 255]
         }
      }
  }

   // Set up our fractal

   formula {

      // Initialize variables

      c = current;
      z = current;
      c0 = [-0.15, 0.18];
      c3 = [-0.13,0.49];
      c5 = [-0.99,-0.0052];
      c7 = [0.35,0.44];
      c8 = [-0.14,0.69];
               
      // Stopping condition, note the unusual: cos(imag(z)) > sin(real(z))
      // portion - it is this part of our stopping condition that creates
      // the checkerboard appearance this fractal has

      while(mag(z)<8 && $count<990)
      {
         // Formula for iteration
         x = z; y=z; 
         s0=c0;
         s0=s0/x;
         s0=s0*c3;
         s0=s0/c5;
         s0=s0+c7;
         s1=c8;
         s1=s1-y;
         s0=s0+s1;
         z=s0;   
         
      }

      // Use color table entry corresponding to the angle that "z"
      // made relative to the origin when the while loop above terminated

      set_color($count+80);
   }
}