Are we in a simulation?

I read this post many, many years ago and every few years I seem to come back to it. Read it and let it sit in your mind and then come back to it again as the times change. I hope tickles your mind as much it tickle’s mine.

He leaned over her shoulder. "This universe is exactlylike ours in every particular, right?"

"Right," she replied.

"So what are they looking at?"

"A simulated universe."

"A simulation of themselves?"

"And of us, in a sense."

"And they're reacting the same way I am?" Tim asked. "Which means the second universe inside that has another me doing the same thing a third time? And then inside that we've got, what, aleph-zero identical recursive universes, one inside the other? Is that even meaningful?"

- https://qntm.org/responsibility