You can become aware that you are like the screen in the movie. You cannot see the screen, you see the images on the screen. Yet the images are not real. If you try to grab them, you grab the screen. Just contemplating this helps. And then you realize that you are like the screen, that is your real nature, and all the images in the universe are superimposed upon you, just as the images of the movie are superimposed on the screen.