Group {
  children [
  mynurb {
  translation -3 3 0
  cp [ 
       0 0 0, 1 2 0, 2 0.5 0, 3 0.5 0, 4 1.5 0,
       0 0 0, 1 0 0, 2 0 0, 2 0 0, 2 0 0,
       0 0 0, 1 -2 0, 2 -0.5 0, 3 -0.5 0, 4 -1.5 0
       ]
  }