applications.collages.collageAlgebra:
{
  
  x1 = const(.7),
  y1 = const(1.1),

  S = { polyline((#x1,#y1),(1,1)) },
  A = #S,
    
  f1 = similarity((0,0) -> (0,0), (1,1) -> (#x1,#y1)),
  f2 = scale(.9,.9) . translate(.05,.05),
  F = < #S, f1, f2 >,
  G = < #S, f1>
    
}
