public static void main(String[] args) {
		DrawingPanel drawing = new DrawingPanel(200, 200);
		Graphics canvas = drawing.getGraphics();
		
		canvas.setColor(Colors.black);
		canvas.fillRect(0, 0, drawing.getWidth(), drawing.getHeight());
		
		canvas.setColor(Colors.white);
		
		for (int i = 5; i > 0; i--) {
			canvas.fillRect(i*20, (5-i)*20, 20, 20);
		}
	}