/** create the graphical objects for the scene */
  private void makeScene() {
    body = new ARectangle(bodyColor);
    body.setSize(bodyWidth, bodyLength);

    bezel = new ARectangle(Color.BLACK);
    bezel.setSize(bezelWidth, bezelLength);
    bezel.setColor(Color.LIGHT_GRAY);

    onButton = new AEllipse(Color.BLACK);
    onButton.setSize(onWidth, onLength);

    volSlider = new ALine();
    volSlider.setColor(Color.BLACK);
    volSlider.setPoints(volSliderX, volSliderY, volSliderX + volSliderLen, volSliderY);
    volSlider.setThickness(2);

    volLevel = new ALine();
    volLevel.setColor(Color.magenta);
    volLevel.setPoints(volLevelX, volLevelY, volLevelX, volLevelY + volLevelLen);
    volLevel.setThickness(2);
  }