Consider a particular system, S1, of a squirrel eating a nut.
S1 can be described in a lot of different ways. The way I just described it is, I agree with you, a human-mind-centric description.
But I could also, equally accurately, describe it as a particular configuration, C1, of cells. Or a particular configuration, A1, of atoms. Or a particular configuration, Q1, of quarks.
Those aren't particularly human-mind-centric descriptions, but they nevertheless describe the same system. Q1 is, in fact, a description of a squirrel eating a nut, even though there's no way I could tell from analyzing Q1 whether it describes a squirrel eating a nut, or a nut eating a squirrel, or a bushel of oranges.
That I am using a human-level description to refer to it does not make it somehow an exclusively human-level as opposed to quark-level system, any more than the fact that I'm using an English-language description to refer to it makes it an English-language-level system.
And Q1continues to be a quark-level description of a system comprising a squirrel eating a nut even if nobody observes it.
Essentially you are saying that Q1=S1. This is certainly not true.
Clearly Q1 and S1 are related. If we could vanish a large contiguous chunk of Q1, we might see a chunk of squirrel disappear in S1; so they have some time-space context in common.
But Q1 describes a system of quarks and S1 describes a system of a squirrel and a nut. They are represented in different "languages"; to compare them you must convert them to a common "language". The relationship between Q1 and S1 is this process of language conversion -- it is the layered proces...
Certain kinds of philosophy and speculative fiction, including kinds that get discussed here all the time, tend to cause a ridiculous thing to happen: I start doubting the difference between existence and non-existence. This bothers me, because it's clearly a useless dead end. Can anyone help with this?
The two concepts that tend to do it for me are
* Substrate independence/strong AI: The idea that a simulation of my mind is still me. That I could survive the process of uploading myself into a computer running Windows, a cellular automaton run by this guy, or even something that didn't look like a computer, mind, or universe at all to anyone in the outside world. That we could potentially create or discover a simulated universe that we could have ethical obligations towards. This is all pretty intuitive to me and largely accepted by the sort of people who think about these things.
* Multiverses: The idea that the world is bigger than the universe.
My typical line of thought goes something like this: suppose I run a Turing Machine that encodes a universe containing conscious beings. That universe now exists as a simulation within my own. It's just as real as mine, just more precarious because events in my reality can mess with its substrate. If I died and nobody knew how it worked, it would still be real (so I should make provisions for that scenario). Okay, but Turing Machines are simple. A Turing Machine simulating a coherent universe containing conscious beings can probably arise naturally, by chance. In that case, those beings are still real even if nobody on the outside, looking at the substrate, realizes what they're looking at. Okay, but now consider Turing Machines like John Conway's Fractran, which are encoded into an ordered set of rational numbers and run by multiplication. I think it's fair to say that rational numbers and multiplication occur naturally, everywhere. Arithmetic lives everywhere. But furthermore, arithmetic lives *nowhere*. It's not just substrate-independent; it's independent of whether or not there is a substrate. 2+2=4 no matter whether two bottlecaps are being combined with two other bottlecaps to make four bottlecaps. So every Turing-computable reality already exists to the extent that math itself does.
I think this is stupid. Embarrassingly stupid. But I can't stop thinking it.