4.1 The Window, Not the Screen

Listen to music for a moment—something you know well, something that moves you. Track the melody, feel the rhythm arrive, hear an instrument change the texture of the whole. The music presents itself as out there, coming from the speakers, organized in time as a thing in the world.

Now try to shift your attention from the music to your hearing of it. Not the sounds, but the experience of sound. Not what you hear, but the inner event by which you hear it.

The attempt may return you to the music: a held note, the space between phrases, the way the sound fills the room. Hearing does not readily offer itself as a second sounding thing to inspect. Something billed as a screen behaves more like a window. If your report differs, keep it in view; the exercise asks what you find, not whether you can give the approved answer.

This observation has a name. Philosophers call it the transparency of experience, the phenomenon whereby perceptual experience, examined from the inside, ordinarily returns us to the objects of experience rather than to experience itself. The modern argument dates to 1990, when Gilbert Harman pressed the observation, in one short paper, into an argument with real edge: when we introspect a perceptual experience, we find only its intentional objects (the things the experience is directed at, the things it represents) and never a further layer of properties belonging to the experience itself.¹ The term sounds technical; the underlying observation stays stubbornly ordinary. The music made the point first; now take the standard visual case. Look at the wall in front of you and ask not what you see but what properties of your experience you notice. Attention ordinarily returns to the wall: its color, shape, and distance appear as features of the wall, not as paint on a second surface. You can also tell that you are seeing the wall rather than imagining it. That is awareness of the mode in which the wall is presented, not acquaintance with another colored item between you and it. The experience does not vanish; it gives the world in a particular way.

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4.2 What the Inner-Object View Predicts

The inner-object theorist has a reply ready: perhaps what you call “the wall” is an inner item presenting itself as external. The exercise alone cannot rule that out. On the sense-datum view, awareness immediately encounters a color-patch or sensory impression which in turn represents the wall.² The wall causes the episode; the datum supplies what awareness meets.

That view promises to explain why the same apparent scene can occur when the senses mislead us. The last chapter showed that error does not require an inner bearer, but it did not disprove every theory proposing one. Transparency tests a narrower claim: can the theory point to introspection as a direct disclosure of that bearer?

If it can, we ought to find more than the world merely seeming a certain way.

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4.3 The Limits of Introspective Evidence

If experience consisted in awareness of directly inspectable inner objects, each bearing properties that resemble or fail to resemble the world outside, introspection ought to find them. Turn your attention inward and you should encounter inner redness, inner smoothness, inner warmth: the very items with which, on this view, you have the most direct acquaintance.

Attention ordinarily returns to the wall, the music, the weight of the book in your hand. The colors and shapes appear as properties of a mind-independent wall, not as intrinsic properties of a mental bearer. This costs the theory its advertised introspective advantage without ruling out its interpretation by fiat. If it posits a bearer that appears as the wall, it owes an argument for that reading. The same report cannot serve as unmistakable evidence that its ontology has been directly inspected.

Harman put the point with his own example: attend to the intrinsic features of your visual experience of a tree, and the only features you find to attend to are features of the tree — its green, its height, out there, presented as belonging to it.³ Look through the experience and you reach the world; look at it rather than through it, and no second colored bearer appears. The glass is clean. Nearly a century before Harman, G. E. Moore noticed the same pressure and gave it a fittingly optical name. Moore taught at Cambridge and would as soon defend common sense against a brilliant theory as agree with it. Trying to introspect a sensation of blue, he reported, one finds the blue and very little else; the sensation itself he judged diaphanous, see-through.⁴ Moore immediately added that the conscious element could become distinguishable once one knew what to look for. He drew a different moral than the one this book will draw. What matters here is the first pull of attention: it goes to the blue. Harman gave that pull its modern dialectical edge.

Transparency reports what introspection finds; it does not yet tell us what experience consists in. Block’s strongest reply posits no further object hidden from attention. His “mental paint” names a nonrepresentational property of the experiential state, one that may help constitute what seeing is like without appearing in the scene.⁵ Transparency removes direct acquaintance with such paint as evidence. Chapter 6 must supply the positive case that no constitutive residue remains.

Many readers hold a modern descendant of the picture: the brain builds a model of the world, transparent to its subject. As a claim about the object of awareness, the view faces a fork. If the subject gets the wall the model presents and never the modeling, the model belongs to the vehicle of seeing. If experience instead presents the model as another object besides the wall, transparency presses against it. Either way, calling the architecture a model does not settle Block’s question about whether properties of the vehicle help constitute phenomenal character. Chapter 6 takes that up.

It would be cheating to run transparency only on the cases that flatter it. The real test comes from the awkward ones, and they have names.

1. Think of a page seen without the glasses needed to read it: the blur seems to be in the seeing, a property of the experience if anything is, since the page itself has not gone soft.
2. A colored afterimage can seem to drift across a wall, a patch of color no surface there wears.
3. Phosphenes, the flashes or swirls that can occur without light from a matching object, likewise seem to answer to nothing in the room. No need to produce them by pressing your eyes or staring at a bright source; their description gives us the problem.

If transparency holds, where do these live? They look exactly like the inner items the view denies.

Blur is the hardest case. You may see a sharp-edged page blurrily without seeing the page as blurred. The intentionalist must explain that difference by the determinacy, structure, or mode of a world-directed presentation without positing a fuzzy inner object. Afterimages present a related difficulty. An experience can present a colored patch at a region of the wall where no patch exists; in reflective cases, it can present the patch as an afterimage rather than as paint on the wall. The intentionalist owes an account of that apparent location which does not turn the patch into a mental object. Phosphenes raise the same demand in a starker form. On all these cases transparency must finally make good, against Block and against Boghossian and Velleman, who take blurry vision in particular to expose a residue of non-representational character.⁶ The full settlement waits for Chapter 6, which builds the positive thesis and works out the relevant distinctions.

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4.4 Vehicle and Content

That leaves the question the inner-object view was built to answer: what about illusions and hallucinations? The view’s appeal drew heavily on cases where perception fails. If you’re aware only of the world and not of inner objects, what are you aware of when the stick looks bent in water that isn’t, or the building looks pink in a sunset, or, the limit case, when you hallucinate something that isn’t there at all?

A full answer takes several chapters, but one distinction has to be visible before we can state the debt clearly.

A neural process can serve as the vehicle of an experience. Its content specifies how things are presented: a stick as bent, a building as pink, a figure as standing before you.⁷ The stick or building, when present, supplies the object; in hallucination no matching object need exist. The vehicle lies in the brain. This fact alone does not tell us where awareness lands.

Chapter 5 turns this distinction on the bent stick; Chapter 6 asks whether content can carry the weight placed on inner items.

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4.5 The Exercise Is the Argument

The exercise has now crossed vision and hearing. When neuroscience says the brain “constructs a model of the world,” the phrase invites an inner facsimile between perceiver and world. Transparency says: attend again; the facsimile never appears. The same caution will matter when we ask what a fluent machine sees. Whatever seeing involves, watching an inner show never made the list.

I remember the night this first unsettled me — somewhere in the middle of working through Harman’s paper for the first time, too much coffee and too little patience for philosophy that refused to be plain. The observation was almost embarrassingly simple, and it still took me a while to trust it, to resist the pull of three centuries insisting that something had to be there in the middle: some inner layer, some private what-it’s-like-ness hovering between the mind and the world. Harman’s observation felt faintly impolite, like pointing out that the emperor had been underdressed the whole time and no one had wanted to be the one to say so.

The exercise supplies the argument’s negative half: no second surface announces itself as the bearer of what we hear or see. Even hallucination can present an apparent world without reaching an existing object. What experience therefore consists in remains to be earned. My dinner guests have learned to change the subject. You, I hope, will stay for another course.

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Chapter Summary

The claim. Perceptual experience has a transparent core. When we look within, sensory qualities usually appear as qualities of the music, wall, or tomato, not of a second inner bearer.

Where the argument stands. This first-person result recurs in ordinary cases, though people differ in their reports. It costs the inner-object view its claimed advantage: attention reveals no private item whose colors and shapes stand in for the world. Blur, afterimages, and phosphenes leave the intentionalist with debts to pay, not victories already won.

What’s left open. Transparency does not decide between every theory compatible with the report. Chapter 5 separates representing from an object represented; Chapter 6 must argue for what phenomenal character consists in.

The hand-off. The result leaves us with the difference between the vehicle, the state that represents, and its content, what that state presents. The next chapters use this tool to explain illusion and hallucination without inner objects. It also blocks a bad test for machine consciousness: a private inner show supplies the wrong standard for humans and, by itself, tells us nothing about machines.

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Notes

1. Gilbert Harman, “The Intrinsic Quality of Experience,” Philosophical Perspectives 4 (1990): 31–52. The paper is the locus classicus for the contemporary transparency argument. Harman’s crucial move is to distinguish the properties of an experience from the properties the experience represents its object as having, and then to observe that introspection reliably delivers the latter and never the former. The observation itself has a longer pedigree — Moore’s early work supplies the most direct precursor — but Harman gave it its modern dialectical role. ↩
2. For the sense-datum tradition in its classic form, see the opening chapters of standard mid-century texts in the theory of perception; Tim Crane, “The Origins of Qualia,” in History of the Mind-Body Problem, ed. Tim Crane and Sarah Patterson (London: Routledge, 2000), reconstructs how the view came to treat the immediate objects of perceptual awareness as mind-dependent items and traces the philosophical pressures that produced it. For a contemporary survey of the dialectic between sense-datum theories and their realist rivals, see James Genone, “Recent Work on Naive Realism,” American Philosophical Quarterly 53, no. 1 (2016), and Sydney Shoemaker’s discussion of inner-sense models in “Self-Knowledge and ‘Inner Sense,’” Philosophy and Phenomenological Research 54 (1994): 249–314. ↩
3. Harman, “The Intrinsic Quality of Experience,” 39. Harman’s claim is that when Eloise attends to the intrinsic features of her visual experience of a tree, the only features she finds available to attention are features she experiences the tree and its surroundings as having — not features of the experience itself. For a sympathetic assessment of the argument’s dialectical force, see Alex Byrne, “Intentionalism Defended,” Philosophical Review 110 (2001): 199–240. ↩
4. G. E. Moore, “The Refutation of Idealism,” Mind 12 (1903): 433–453, at 450, on the “diaphanous” character of the sensation. Three cautions belong here. First, Moore deployed the observation in the service of a realism about sensa that this book rejects — the diaphanousness of the sensing was, for him, compatible with there being a sensum sensed; the transparency tradition after Harman turns the same observation against inner objects. Second, the word “diaphanous” has since been used in more than one way — Galen Strawson, for instance, uses it to mark something other than Moore’s point (see “Real Direct Realism,” 2015) — so the term should be handled with care. Third, and most relevant, Moore’s very next sentence takes half of it back: “Yet it can be distinguished, if we look attentively enough, and if we know that there is something to look for.” Moore himself judged the diaphanous element findable, and the anti-transparency literature (Kind and Stoljar, cited below) leans on precisely that concession. What the main text borrows from Moore is therefore only the reported phenomenology, not his verdict on it: attend to the sensing of blue and you find the blue. For careful contemporary engagement, see Amy Kind, “What’s So Transparent About Transparency?,” Philosophical Studies 115 (2003): 225–244, and Daniel Stoljar, “The Argument from Diaphanousness,” in Language, Mind and World, Canadian Journal of Philosophy Supplementary Volume 30 (2004): 341–390. ↩
5. Ned Block, “Mental Paint and Mental Latex,” in Philosophical Issues 7, ed. Enrique Villanueva (Atascadero, CA: Ridgeview, 1996), 19–49; and “Mental Paint,” in Reflections and Replies: Essays on the Philosophy of Tyler Burge, ed. Martin Hahn and Bjørn Ramberg (Cambridge, MA: MIT Press, 2003), 165–200. Block’s view differs from classical sense-data theories: mental paint counts as a property of the experiential state, not as the object of an inner perceptual relation. He grants that attention commonly delivers intentional objects while denying that this settles whether phenomenal character outruns representational content. Transparency alone leaves that dispute underdetermined; Chapter 6 supplies the positive thesis needed for the full reply. ↩
6. The hard cases for transparency — blurry vision, afterimages, phosphenes — are the standard pressure points, and the intentionalist treatments sketched here are developed at length later. On afterimages and other “phenomena without an object” handled representationally, see Michael Tye, Ten Problems of Consciousness: A Representational Theory of the Phenomenal Mind (Cambridge, MA: MIT Press, 1995), ch. 3, and Consciousness, Color, and Content (Cambridge, MA: MIT Press, 2000), ch. 3. Blurry vision is the case the anti-representationalist presses hardest: Paul Boghossian and J. David Velleman, “Colour as a Secondary Quality,” Mind 98, no. 389 (1989): 81–103, and Ned Block, “Mental Paint” (cited above, n. 5), treat blur as a feature of the experience rather than of its content. The intentionalist response must distinguish seeing a sharp object blurrily from seeing a blurred object sharply. Tye develops a determinacy-based reply in Consciousness, Color, and Content, ch. 3; Crane treats blur and afterimages as differences in the mode of a world-directed presentation in “Introspection, Intentionality, and the Transparency of Experience.” The phenomenon is flagged here only to mark that transparency must answer the unflattering cases, not merely the easy ones. ↩
7. The vehicle/content distinction is drawn with particular clarity in Tim Crane, “Is There a Perceptual Relation?,” in Perceptual Experience, ed. Tamar Szabó Gendler and John Hawthorne (Oxford: Oxford University Press, 2006), 126–146; see also Crane, “Introspection, Intentionality, and the Transparency of Experience,” Philosophical Topics 28 (2000): 49–67, which presses precisely the point that the transparency datum is in the first instance a claim about introspection and must be handled carefully before it is made to carry metaphysical weight. Crane’s own position is more cautious than the full-strength intentionalism this book defends in Chapter 6; the distinction is borrowed here for its diagnostic value, independent of where one ultimately lands. ↩