>>11207676First, consider what your perception of "reality" is. Lets simplify things a bit and say that "you" is your brain (putting aside stuff like the nervous system etc). When you "see" something, actually it's just your brain getting electric/chemical signals. When you hear, it's actually just your brain getting electric/chemical signals. This goes on for all senses. In conclusion, everything you sense is not reality; everything you sense is merely electric/chemical signals.
Expanding on this, there's no way for you to actually know if anything outside yourself actually exists; maybe those signals being sent to your brain are actually NOT from an organ that is registering real light hitting cones. Maybe the signals are just being sent from a simulator. This concept was explored in the movie The Matrix, although even earlier than that there was Rene Descartes "Evil Demon".
Okay, so maybe everything in the universe is a simulation, but you're not, right? Lets go deeper. What if you made an exactly perfect, flawless scan of your brain, down to the subatomic particles, and even deeper, and then ran it in a perfect, flawless physics simulator on a computer that had infinite storagespace and energy? Also, the computer will feed in the exact same fake data that the "evil demon" was feeding you before. What would this simulated brain experience? If the simulation was truly perfect, then it would feel the exact same experiences you are feeling right now.
In conclusion, you could be in reality now, or you could be in a simulation. There is literally no possible way for you to ever test this or prove it isn't true. There is absolutely no perceivable difference you could ever find to disprove this concept.
