private static PixImage randomImage(int i, int j) {
		/**
		 * Visit each cell (in a roundabout order); randomly pick a color.
		 */
		PixImage image = new PixImage(i, j);
		Random random = new Random(0); // Create a "Random" object with seed 0
		int x = 0;
		int y = 0;
		for (int xx = 0; xx < i; xx++) {
			x = (x + 78887) % i; // This will visit every x-coordinate once
			for (int yy = 0; yy < j; yy++) {
				y = (y + 78887) % j; // This will visit every y-coordinate once
				image.setPixel(x, y, (short) random.nextInt(256),
						(short) random.nextInt(256),
						(short) random.nextInt(256));
			}
		}
		return image;
	}