applications.collages.collageAlgebra:
  {
    sq = { filledPolygon((-20,-20),(20,-20),(20,20),(-20,20)) },
            
    f1 = translate(-40,-40) . scale(1/3),
    f2 = rotate(90) . translate(0,-40) . scale(1/3),
    f3 = translate(40,-40) . scale(1/3),
    f4 = rotate(90) . translate(-40,0) . scale(1/3),
    f5 = rotate(90) . scale(1/3),
    f6 = rotate(90) . translate(40,0) . scale(1/3),
    f7 = translate(-40,40) . scale(1/3),
    f8 = rotate(90) . translate(0,40) . scale(1/3),
    f9 = translate(40,40) . scale(1/3),
    F = <f1,f2,f3,f4,f5,f6,f7,f8,f9>,
    
    g1 = translate(-40,0) . scale(1/3,1),
    g2 = translate(40,0) . scale(1/3,1),
    G = <g1,g2>
    
  }
