static void showZoomedScreenClipInPlace(final Rect r, final BufferedImage clip, final double zoom, final double seconds) {
  swing {
    BufferedImage scaledClip = scaleBufferedImage(clip, zoom);
    JWindow win = makeWindow(jImageLabel(scaledClip));
    Pt p = centerOfRect(r);
    int w = scaledClip.getWidth(), h = scaledClip.getHeight();
    win.setBounds(p.x-w/2, p.y-h/2, w, h);
    win.setAlwaysOnTop(true);
    win.setVisible(true);
    disposeWindowAfter(win, seconds);
  }
}