I think we have reached an impasse. From where you see it, my characterization of the issue is just an odd way of talking which creates problems. For me, you are just insisting that things exist unperceived by definition. I will try once more to try to make you see it my way. — PossibleAaran
Hehe, I'm not being obtuse, I assure you. I used to be captivated by all this stuff myself, so I understand its attraction.
Look at your computer. What do you see, literally? — PossibleAaran
A computer.
Describe every property of the thing you are looking at, without adding any property which you can't see. You might say things like 'a black, rectangular, three dimensional thing with letters on it'. — PossibleAaran
Why would I describe it in such peculiar terms? "A black rectangular three dimensional thing with letters on it" could just as easily describe a plaque as a computer. It's a computer, so it's implicitly and necessarily a three-dimensional thing, and has a shape and colour.
The reason I think it's a
computer is because I'm familiar with computers and it's very similar to other computers I've seen, and it functions as a computer; not because it's a "black rectangular three-dimensional object." It is those things, but those properties are incidental, they aren't the signifiers of it being a computer, and I don't get anywhere closer to specifying it as a computer just by specifying a comprehensive list of
those sorts of properties. The signifiers of it being a computer are more to do with its internal structure and its functionality (use it for email, browse the internet, play videogames, etc.).
Again, you keep denying that you're mistaking experience for object, but this smells very much like you're asking me to reduce my description of my experience to my sensory experiences in abstraction from what they're sensory experiences of, and then somehow build up or infer an idea of what I'm perceiving from there.
No matter how careful and detailed is your description, you will never say 'which exists when I am not perceiving it'. — PossibleAaran
I wouldn't say "which has a motherboard, CPU and RAM inside it" either, but those are also implicit in the thing's being a computer, yet my not seeing those things doesn't mean it's not a computer.
The point is, there's no occasion to add "which exists when I am not perceiving it" because I already
know it exists when I'm not perceiving it,
because it's a computer.
It's possible that I could be mistaken that it's a computer, but if it
is a computer then I can't be mistaken about its persistence while I'm not looking, and that persistence is not something I need to "see" or "infer."
If you did say this, you would no longer be describing, literally, what you can see. You would just be adding a property which you believe the object to have, — PossibleAaran
No, no, no. I already "added the property" (so to speak) when I saw the thing as a computer. The property is implicit in the thing's being a computer. And I can test that property, if I want, by the means I pointed out, just as I can test the computerhood of the object by seeing if I can email with it, etc.
but which you can't see that it is, rather like the amateur artist who draws the human eye as a perfect oval, because that's the shape he believes it has (artists have to work quite hard to learn only to draw what they see and nothing more). — PossibleAaran
Yes, exactly, and the fact that you use this example suggests, again, that you're doing what you say you're not doing. Because the perspectival proportions are not what the artist literally sees, what the artist literally sees is the object, the perspectival vision is precisely the result of training in abstracting away what one knows of what one sees, and sort of beholding one's sensory experience in suspension, as something like a projection on a flat surface with certain proportions of colour and shape. (Amusingly in this context, parsing a photograph is the opposite process.)
Similarly, this tangle you're getting yourself into is the result of you abstracting away what you know of the thing you're experiencing, so that "literally" to you really means a detached, truncated description of some sensory experiences in abstraction.
Sure, you're never going to perceive unperceived persistence that way, but you'd never be able to perceive
perceived persistence that way either, because you've already cut yourself off from directly perceiving
any object that isn't pure, present sensory experience. You've already turned yourself into a phenomenalist or idealist by choosing the method you've chosen, so the whole exercise is a sham.
If you really weren't doing what you say you aren't doing, then the answer and the tests I've given you would be sufficient. The fact that you still think a camera test is insufficient, and you still think that you need something extra to prove unperceived persistence, over and above the fact that physical objects are by definition things that exist unperceived, and that that persistence can be tested by the use of various kinds of tools and instruments, demonstrates that you
are after all painting yourself into the corner of a phenomenalist/idealist stance.
If you have never seen the property of unperceived existence, how do you know the object you are looking at has this property? — PossibleAaran
If it's "an object I'm looking at," a physical object, then necessarily it has this property. (If the "object" is just sensory experience in abstraction that I'm sheerly beholding, on the other hand, then necessarily it doesn't.)
Can you infer that property from what you do see? If you can't, then how can you possibly know it? 'Know' is being used here merely in the weak sense of reliably produced true belief. How can you reliably believe it? — PossibleAaran
Some people are incurious and never open up their computers, so they've never seen the motherboard and CPU. So how do they know their computer has a motherboard and CPU if they haven't seen it?
Similarly, I'm incurious about the computer's existing unperceived, so I've never done the camera test. But I could easily do it.
We can be incurious about these things and still know about them because having a motherboard and CPU is a necessary implication of a thing's being a computer, and persisting unperceived is a necessary implication of a thing's being a physical object.
In these examples, the properties (respectively, having a motherboard and CPU, existing unperceived) aren't being directly perceived in sensory experience, nor are they inferred from sensory experience, they're inferred from the things' being what they are, supposing that they truly are those things.
You have said that if you take a picture with a camera then that will prove that things exist unperceived. But how? Since you cannot literally see that things exist unperceived, I took it that you meant to offer an argument for it here, but I think that argument is fallacious. Here is something we ordinarily believe about cameras: you can put a camera up in a room when no one is in it and the camera can get you a picture of the things which exist in that room when no one is there. Equally, you could close your eyes and take a picture of your computer, and the camera would show you what the computer was doing when you weren't looking.
I think once I lay out this ordinary understanding of a camera in this way, you can see immediately that nobody who wasn't already convinced of Realism would accept without further question that any of it is true. Someone who does not believe Realism to be true would not accept that you can put a camera up and leave it to take a picture of what exists unperceived. — PossibleAaran
Yeah, but there's nobody who actually believes that. People who say they don't believe in Realism don't really disbelieve Realism, they just disbelieve Realism in toy examples where they're hypnotizing themselves into artificially shrinking their experience of the world down to the experience of sensory qualities in abstraction. It's a rakish pose.
I understand what you're saying: the camera is on a level with the laptop, and if the laptop's unperceived existence is dubious, so is the camera's, so one can't be used to prove the other.
But neither the laptop nor the camera's unperceived existence is at all dubious -
if they're truly laptops and cameras.
Now they might indeed be something else - a laptopX and a cameraX, both of which have all the properties of normal laptops and cameras, with the exception of unperceived existence. But you'd have to demonstrate that's what they are. And you can't demonstrate that with your "let me literally behold only my sensory experiences in abstraction" game, any more than you could demonstrate
perceived existence from that stance.
'To all appearances seem like normal physical things' is tantamount to 'to all appearances seem like things which exist unperceived', but as I have pointed out, you never see that something exists unperceived and so, literally, it never seems that way. — PossibleAaran
"You never see that something exists unperceived". Genius
:)
But one wouldn't
expect the property of unperceived existence to be something one could see.
Fortunately, you don't need to "see that something exists unperceived" to know that the physical thing before you exists unperceived, because as I said, that's already an ironclad implication of things being physical objects.
You
have to accept this, unless you're going the phenomenalist/idealist route you deny. It's completely incoherent to say, "This is a physical object, but I can't be sure, from inspection, whether it exists unperceived."
Present inspection isn't the sort of thing you could logically expect to reveal that particular property. What you
could logically expect to reveal that property would be things like the camera test.
Now, you might say something like this:- "Ha! You think you are perceiving
physical objects, but for all you know you might be perceiving something that to all appearances look and behave like physical objects, but lack the property of existing unperceived."
In that case we'd do the camera test. If the camera showed nothing there when I took the picture,
that would be a verified example of something blinking out of existence when unpercieved.
BUT THEN IT WOULDN'T BE A PHYSICAL OBJECT AS WE UNDERSTAND PHYSICAL OBJECTS It would be something new, something mysterious and interesting, that shares some properties with physical objects, but lacks the property physical objects have, of existing unperceived.
SUMMARY:- We don't "build up" the idea of physical objects from sensory experience, we
POSIT such a thing as physical objecthood and then we test with
POSSIBLE tests, using perception as the very standard of judgement, whether a thing answers to those properties. (The process is the same throughout all cognition, right up to science: generate-and-test. What would be the logically necessary outcome for sensory experience, for perception, supposing x is true? Test it.)
Unperceived existence is certainly one of those properties, but since seeing the unseen is a logical impossibility it's not a possible test for unperceived existence; but if something passes
possible tests for unperceived existence (like using cameras or other instruments), then that is a sufficient test for unperceived existence.