startshape foo

shape foo {
  hsb = rgb2hsb(107/255, 22/255, 65/255)
  CIRCLE[h hsb[0] sat hsb[1] b hsb[2]]
  rgb = hsb2rgb(hsb)
  hsb2 = rgb2hsb(rgb)
  CIRCLE[h hsb2[0] sat hsb2[1] b hsb2[2] x 1]
  CIRCLE[h hsb y 1]
  CIRCLE[h hsb2 x 1 1]
}