applications.collages.collageAlgebra:
{
  r = const(10),
  s = const(.90334),
  a = const(45),
  
  A = { filledEllipse(0,0,#r,#r)<0,0,1> },
  B = #A,
  
  f1 = scale(#s) . translate(0,#r * (1+#s)),
  f2 = scale(#s) . translate(0,#r * (1-#s)) . rotate(#a / 2),
  F = < #A, f1, f2 >,
  G = < #A, f2 >,
  
  r = rotate(-#a),
  right = <r>,
  
  col = colourOperation(r|.05:1,g|.05:1,b||.15:0)
}
