" Three Floors " was a science fiction story written by Liu Cixin. It described the future crisis faced by Earth civilization and the road to salvation. There was a prophecy: At some point in the future, humans would discover that the digital world they created was not the entire universe, but a small part of it. The order and rules in the digital world no longer applied to the real world because the real world had its own rules. Mankind will have to face the fact that they once thought they had everything in the universe but have now made a mistake. It would be a huge disaster because mankind would lose control of the universe. This prophecy involved human understanding and control of the universe, causing people to worry and think about the future. Was this prophecy true?