applications.collages.collageAlgebra("dragon algebra"):
{
  line = { filledPolygon((-1,0),(-.7,-.3),(.7,-.3),(1,0),(.7,.3),(-.7,.3))<.5,.5,0> },
  
  f1 = similarity((-1,0) -> (-1,0), (1,0) -> (0,-1)),
  f2 = similarity((-1,0) -> (1,0), (1,0) -> (0,-1)),
  F = <f1, f2>,
  
  left  = colourOperation(r|.5:0,g|.5:1),
  right = colourOperation(r||.5:1,g||.5:0)
  
}
