This advertisement asks you to imagine what these simple block formations mean. Using shadows, they tell us that it’s simply our imagination that makes these blocks come alive and, that through our experience, we can see anything through them.
Did you notice that the background colors were chosen to signify the sea (blue) or land (green)? Or that the airplane is hovering while the other three blocks are set firmly on the ground? Advertising doesn’t get as simple (or as meaningful) as this.