Picture yourself sitting in an old cinema all by yourself, watching a movie. Turn your head towards the back wall and see there a big window. Behind the window, there is a projection machine. In that machine, a long, wide film is running, a film you have created.
A strong light travels through the film towards the screen. You can see the beam of light getting wider as it travels through the air, showing flickers of colors and movement inside it. Follow the beam of light with your eyes as it keeps on going and getting wider, until you are facing forward and looking at a huge screen, which practically fills your entire fields of vision.
As you look, you become absorbed in the movie, finding yourself emotionally attached to some of the characters, fearing some of the others, hating a few and getting carried away with the story.
Real life is very much the same. We become absorbed in our own story, which we project onto the world. When we interact with other people, we each look at our own “film” and can get into all kinds of trouble.