"Breaking The 5th Wall"

You've probably heard of the saying "Breaking the 4th wall." It's what we say when a character in a cartoon or a book acknowledges that their existence is fictional. But, what if, someone, a book character, acknowledged the existence of the real world? What if, in some weird way, they really exist? Technically, they exist within our imagination. But, what if there was a way to link our imagination, to the real world?