// The pollution created by a factory.
paper 0
forever
{


   pen 100

   //a solid, grounded factory
   repeat A 22 45
   {
      line A 0 A 28
   }
   pen 62
   repeat B 12 72
   {
      line B 0 B 20
   }
   pen 100
   repeat D 57 62
   {
      line D 0 D 7
   }

   //light pollution particles in motion
   command particle X Y P
   {
      pen P
      line (X-2) (Y-3) (X+2) (Y+3)
      line (X) (Y-3) (X) (Y+3)
      line (X-2) Y (X+2) Y
   }
   particle   20
}

//The objective of this piece is to contrast between
//a heavy, massive object (the factory) and light, airy
//objects (the pollution).  This contrast is achieved
//through varying the shape, color, size, and movement
//between the two objects.