static Color blendColors(Color a, Color b, double bish) {
  bish = normalizeTo0to1(bish);
  ret new Color(
    (float) blend(a.getRed()/255.0, b.getRed()/255.0, bish),
    (float) blend(a.getGreen()/255.0, b.getGreen()/255.0, bish),
    (float) blend(a.getBlue()/255.0, b.getBlue()/255.0, bish));
}