Two men and a woman are seated behind a small coffee table in a well-lit waiting room.
Sam: “Excuse me, but is there an apple in that fruit bowl?”
Ned: “Um, huh, what? What fruit bowl, where?”
Sam: “That one there, the one right in the middle of the table. The one directly in front of you.”
Ned [now staring intently at the table]: “There’s nothing on the table that I see – no fruit bowl, no fruit, no nothin’ – what are you talking about? [turning to the woman] Do you see anything on the table?”
Agnes: “No.”
Ned under his breath: “Whew! So I haven’t lost my mind after all.” [smiling, jokingly to Sam] “Nope, sorry mister, but there is no apple in your invisible bowl unless of course it is invisible, too!”
Sam serious: “OK, quit kidding around. Just hand me the bowl and I’ll look take a look for myself.”
Ned puzzled: “So you mean you’re serious? Really? Look, there is no fruit bowl on this table. I’m not sure what game you’re playing here, mister, but if you don’t believe me, just ask this lady and she will tell you the same thing that I . . .”
Agnes interrupting: "Well, no, I can’t go that far. I can only say that I don’t see anything on the table. I can’t say that there is no fruit bowl on the table. There very well may be one there.
"I mean, it’s possible that we’ve both lost our minds. Or maybe we’re dreaming or hallucinating. Maybe some sort of neurotransmitter/chemical agent was, unbeknownst to us, slipped into our morning coffee and this prevents our brains from ‘seeing’ anything on the table. Maybe the fruit bowl is perfectly camouflaged to blend in with the table. Maybe an evil demon exists who prevents us from seeing the fruit bowl. Maybe we lack the necessary faith that is required to believe that the bowl is there.
“Unless you can provide evidence that all these possibilities and a vast number of others are false, then it is just as likely that a fruit bowl is there as it is that it is not.”
Ned: "Now, wait a minute. That’s a non sequitur. Your argument does prove a conclusion but it doesn’t prove the conclusion that you believes it proves. Of course, it’s always possible that we can be wrong about any observation that we make. But no one is arguing that point. The point is, is that the mere metaphysical possibility of error does not justify epistemic disbelief; that it is no reason in itself to doubt the general reliability of our senses.
“To believe that any particular observation we make is false, we need a reason to believe that the observation is false. Sure, any of the possibilities that you mentioned may actually be the case – perhaps we were drugged, perhaps we are hallucinating, perhaps an evil demon is deceiving us, and so on – but do we have a reason to believe that any of these possibilities are probable? Unless or until we do, we have no good reason to seriously doubt the reliability of our senses.”
Ned continuing, turning to Sam: "Since neither she nor I see a fruit bowl on the table, can you tell me what it is precisely that you see on the table that you are calling a fruit bowl? Can you point out its precise location on the table? . . . describe its size, shape, color, contents? . . . do you have any other sort of evidence of the fruit bowl’s existence . . . I mean, of course, beyond your own insistence that it exists? Do you . . . "
Agnes interrupting and indignant now: “Why should he have to provide you or anyone else with evidence that the bowl exists? Clearly, he believes that it exists, so that is enough to prove that, for him, it exists. Let’s put the shoe on the other foot: Do you have any evidence that it does not exist?”
Ned: “Well, no, not exactly. I mean, I have no more evidence to support my belief that the alleged fruit bowl doesn’t exist than that for which I have to support my belief in the nonexistence of any other nonexistent thing; which is to say that it cannot be observed and that there is no convincing evidence for its existence.”
Agnes: “Well then it’s settled. Since there is no evidence that the fruit bowl exists and none that it does not, we should be honest and admit that we do not know whether or not the bowl exists.”
Ned incredulous: “What?!?! There . . . is . . . no . . . bowl . . . there! Nothing could be more obvious!”
Agnes: “Correction: It only appears not to be there. It might be there.”
Ned: “Sure, it might be there. But it isn’t!”
Agnes: “You don’t know that. You just said that you have no evidence for your belief.”
Ned: "Look, my ‘belief’ that an unobservable, unevidenced fruit bowl doesn’t exist is not really even properly described as a belief. The word ‘belief’ is used in this sort of context only as a matter of convention. It is probably more accurately described as an assumption – an assumption that we all make. Things which are unobservable and for which no evidence exists are assumed to be nonexistent. In a practical sense, that’s all ‘nonexistence’ is. This doesn’t mean that that which we say is nonexistent cannot exist because we’re not talking about that kind of ‘nonexistence’ here, which is to say we’re not talking logical contradiction. It simply means that the nonexistent thing doesn’t exist only as far as we know.
“Every existent thing exists in external reality as something in particular. In theory, we can find evidence for these particular ‘somethings’ because they all have attributes of some sort which allow us to distinguish them from other existent things. Nonexistent things, on the other hand, are all identical. They have no attributes. A nonexistent bunny rabbit looks exactly the same as a nonexistent big, bad wolf or as a nonexistent-anthing-else. They are all of the same non-color, non-shape, and non-size; they all make the same non-sounds and they all emit the same non-odors. A nonexistent slice of chocolate pie tastes exactly like a non-steaming hot pile of nonexistence feces tastes. Believe me, I’ve tasted them both. I can even taste them both now just like I can taste every other nonexistent thing. Point to an empty space and say ‘There is nothing there’ and you will be pointing to all nonexistent things simultaneously. Point to an existent thing and you will be pointing only to the particular existent thing at which you point. This is why we can ‘prove’ or find evidence for what exists in external reality and cannot for what doesn’t exist.”