Why can dreamlike settings be so powerful in literature and films?

They c,an be powerful because it's like the person telling the story is making it powerful by what they say. The author of the book or whoever writes them they can say anything and they can imagine anything and they can think it's very powerful. Some people have very strong and powerful ways in telling story's or even writing things. I think that anything you read it should have smoke powerful stuff in it and very dream able things in it that way you can imagine the things they are talking about or telling about.