go :
  nbf=120
  repeat $nbf
    echo[] " > Frame "{$>+1}/$nbf
    input 512,512,1,3,0
    fx_spline_spirograph[-1] 0,0,50,200,74,6,50,{$>*0.5},8,0,0,50,50,1
    # resize[-1] 256,256,1,3,6,0
  done