applications.collages.collageAlgebra:
{ 
  triangle = { filledPolygon((-10,0),(10,0),(0,sqrt(3)*10))<0,0,1> },

  t1 = translate(0,sqrt(3)*10) . scale(.5),
  t2 = scale(-1,1) . similarity((-10,0) -> (0,0), (10,0) -> (5,sqrt(3)*5)),
  t3 = similarity((0,sqrt(3)*10) -> (0,0), (-10,0) -> (10,0)),
  F = < t1,t2,t3 >,

  col1 = colourOperation(r|.5:1,           g|.5:0, b|.25:0),
  col2 = colourOperation(r|1-sqrt(1/2):.2, g|1-sqrt(1/2):.8, b|.25:0),
  col3 = colourOperation(r|1:.2,           g|1:.8, b|.25:0)

}
