science

You're mixing up nightmares now lol

Yes it's true that everything we perceive could be fake, when I turn my head to the left, the world that I was looking at before could disappear. That's not a new paranoia, it's been around for literally hundreds if not thousands of years.

The simulacrum hypothesis is a little different in that it tries to bring it up to date, and use statistical principles to show that our universe is very unlikely to be real.

The idea is that at some point, a life form will create machines so powerful that they can simulate the entire universe in a way that is indistinguishable from the real universe. There is a real universe in this vision, and it functions very much like the universe which we ourselves inhabit. We are not special in our simulated universe, just like the beings that do live in the real universe are not special. That is, every part of the universe exists in every simulation just as it does in the one real universe. By saying no beings are special, I mean that there are no shortcuts to fool one being (or group of beings) into thinking the universe is more complete than it really is - the entire universe is fully simulated.