import java.awt.*;
import java.applet.Applet;


public class TubeImage extends Applet {

   void paintCircle(Graphics g, int x, int y, int w, int h) {
      Color color = new Color((int)(Math.random() * 256),
         (int)(Math.random() * 256), (int)(Math.random() * 256));
      g.setColor(color);
      g.fillOval(x, y, w, h);
      if (w > 0) paintCircle(g, x + 2, y + 2, w - x, h - y);
   }

   public void paint(Graphics g) {
      Dimension d = getSize();
      paintCircle(g, 0, 0, d.width, d.height);
   }
}