Are we in a simulation (pdf)? A head-pounding philosophy paper:

as far as I can tell, the basic thrust of the simulation argument has real philosophical force and interest—especially when interpreted in the Type 2 manner I’ve argued for here (that is, as not resting on the likelihood of any particular set of empirical claims). Perhaps it does not, ultimately, work—but I don’t think its failures are at all obvious

And whether we buy simulation arguments or not, they are a reminder that the world we see and take for granted is only a part of the world; and that in principle, our overall existential situation could in fact be many different ways, not all of which we are accustomed to considering