Worlds in my head, take 2

It might be obvious by now, but it often occurs to me that my favorite entertainments, chiefly science fiction and fantasy, derive much of their charm from their depiction of alternate realities. Whether it's through books, games, movies, or webcomics, I enjoy imagining (and, if what I've said so far is true, to some extent living in) other worlds. This could easily be described as escapist, and prompts (but does not beg) the question: what's wrong with this world? My first instinct is to get defensive, but that's never a particularly convincing approach. Actually, thinking about it, a better response would be: what do you mean by "this world"?

One of the great triumphs of human society, perhaps even its fundamental purpose, is to convince us that we all perceive the same basic reality. It's obvious why this is generally desirable: we can't work together or communicate if we don't believe that what we see somehow correlates to what others see. Whether this is true or not, as I've said before, is out of my scope for the moment. What's important here is that reality as it's conventionally thought of is just cyberspace on a larger scale, a consensual hallucination including nearly the entire human species. Each of us has different perceptions, but despite this we nearly all believe that we're perceiving the same things. Then to me, what we call "the real world" is the region in which my mental space overlaps with that of (what I believe) most other people think of as real. That is, rather than thinking of the "virtual worlds" I've talked about as alternatives to reality, it makes more sense to think of reality as just another one of these worlds. We each have our own constructed reality, and insofar as we divide it from fantasy that's a constructed division; if we were taught from birth that everything we imagine is real, there'd be no difference to us between reality and fantasy.

Again, it's obvious why this distinction is desirable; a common perspective seems (from the common perspective) to be useful if not necessary to a productive life. Nonetheless, even from within the bounds of our constructed reality we can feel the desire for other interpretations, and can even see it as useful as well, working the idea, if not the reality, of alternate worlds into our own.

So, why fight the status quo, even though it leaves space for the worlds I so cherish? To a certain extent, it's a game; I enjoy thinking about these things, for many of the same reasons that I enjoy science fiction and fantasy. There is, however, a part of me that believes that some serious reenvisioning of reality is going to be required sooner rather than later. The internet has already brought virtual worlds to the forefront to an unprecedented extent, and if developments in any of various technologies continue, including telepresence, AI, and the awkwardly named VR, we'll soon enough have "real-world" issues that can only be discussed coherently by recognizing the proper place of "unreal" worlds. The current debates over intellectual property might well be one of these problems, and of course speculative fiction began to delve into these issues long ago. At any rate, if the future isn't here now, it may well be soon, and if and when it comes this sort of mental exercise will no longer be purely academic. Or so I believe. You have to take anything I say with a grain of salt; after all, I read a lot of science fiction.

The worlds inside my head

Maybe it's the weather, but I'm not really in any mood to write coherently. Nonetheless, there's something I want to say, so I'll just go with the flow and hope you can forgive things like rambling, poor organization, and general incoherence. Let's start off with a little question: what's real? There are various different answers, of course. I don't know whether there's such a thing as objective reality -- in fact, it might well be impossible to know whether there is. I take it as an axiom that everything I know (or think I know) is based on my perceptions -- I don't believe in a priori knowledge. So, not "I think, therefore I am", but rather "I can hear myself think, therefore I am".

Then let's forget about objective reality for the moment. Subjectively speaking, what is real? I've already begged the question -- I'm assuming that my subjective reality is determined by my perceptions. Now, of course, I have a problem, because I perceive things all the time that are, intuitively at least, not real. I might think I heard someone call my name, or misread a word, or dream. What then? The first answer that comes to mind is that, for the moment, even those illusions are real. It's not until I realize I was wrong, until I wake up, that I'm able to perceive the difference between what I thought was true and what was actually true, and until I perceive that difference, it doesn't exist. If I start hallucinating and never stop, that hallucination is my new reality.

The upshot of this is that I believe it's reasonable to say that a completely convincing imaginary world is no more or less real than what we think of as actual reality. For instance, suppose that telepresence* technology advances to the point where I can't tell the difference between meeting someone in person and meeting them through teleconferencing. Then it doesn't seem all that crazy to say that I've met someone "in real life", even if I haven't actually physically been in the same room with them. In mathematics, this is called extensionality -- two functions are extensionally equal if when given the same input they give the same output. I'm sure there's a nice philosophical term for it too, but I don't know what it is.

If you guessed that all of this was just an excuse to fantasize about future technology, you'd be more than half right. From this perspective, an AI capable of passing the Turing Test is basically human, and sufficiently realistic augmented or virtual reality is just as good as actual reality. Bringing it back to the present day, consensual hallucinations like the Internet actually exist, not just as side effects of networks and displays, but as parallel worlds generated by the belief of their users. Less convincing illusions like the worlds inside of novels and movies are slightly less real, little toy worlds in our heads that we can start, stop, rewind, and reshape to some extent. The more the world seems to have an existence of its own, independent of the will of the perceiver, the stronger the illusion -- and thus the reality -- of reality. There's no magical line past which a virtual world suddenly pops into existence; rather, it was there all the time, slowly growing more real as it became more convincing. No matter its substrate -- atoms, words on a page, bits in a computer's memory -- if it seems real to me, then it is real to me.

I've run out of steam for the moment, but I greatly enjoy thinking about this topic, so I'm sure you'll hear about it again if you stay tuned. Again, my apologies for the incoherence.



*Telepresence, as sci-fi as it sounds, is just a fancy word for real-time communication methods such as telephone, video conferencing, instant messaging, etc., that allow people to give the impression of "being present from a distance".