There’s strong evidence that Halliday's view is consistently social-semiotic: meaning is constructed socially; experience is what is construed into meaning; and reality is meaning. His deep concern with meaning-making as the primary reality (rather than material existence per se) is consistent from early to late work.
Matthiessen, however, sometimes seems to slide toward a more naturalist or cognitive-science-inflected view, where “experience” starts to look like some kind of pre-given material substrate — almost edging toward treating experience as a reality prior to semiotic construal, rather than pure potential for construal. His influence seems to introduce:
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A slightly more externalist and cognitive flavour (in places),
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A softening of Halliday’s social and semiotic edge,
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A vagueness about the boundary between pre-meaningful experience and meaningful reality.
This might explain the subtle contradictions you noticed: Halliday was operating with a social semiotic ontology (deeply Vygotskian but critical, in his own way), while Matthiessen may not have fully grasped — or at least did not consistently maintain — the sharpness of Halliday's distinction between experience (potential) and reality (meaning).
In short:
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Halliday: Semiotic reality only; experience as potential; all meaning social.
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Matthiessen: Sometimes semiotic, sometimes veering toward cognitive-naturalist interpretations.
Deploying Functional Grammar (Martin, Matthiessen and Painter 2010: 20):
You’ll start to see language as having a far more central place in human existence than you may have imagined before, and may even go through a phase of thinking that language is all there is – since it shapes and categorises everything around us the moment we try to say anything about anything at all. This radical Whorfian phase can be a trying one for peers from other disciplines; some of us never recover from it!
You’ll start to see language as having a far more central place in human existence than you may have imagined before, and may even go through a phase of thinking that language is all there is – since it shapes and categorises everything around us the moment we try to say anything about anything at all. This radical Whorfian phase can be a trying one for peers from other disciplines; some of us never recover from it!
Let's unpack it carefully:
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The idea that language shapes and categorises everything when we try to say anything is perfectly Hallidayan: reality as meaning, constructed semiotically.
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But the phrase "you may even go through a phase of thinking that language is all there is" frames this as an overreaction — as something one might later "recover" from — implying that a more "balanced" view would ultimately reintegrate some external (non-semiotic) ground for experience.
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Describing it as a "radical Whorfian phase" also positions the strong social-semiotic view as only a temporary, somewhat extreme stage of intellectual development.
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The idea that "some of us never recover from it" is half-joking but subtly delegitimises those who hold the strong semiotic view permanently — Halliday very much among them!
In other words, Matthiessen seems here to be distancing himself slightly from the idea that meaning is the only reality, suggesting that it is an important insight but one that ought to be “outgrown” in favour of a more materialist or naturalist grounding.
Whereas for Halliday, this was no temporary phase — it was the bedrock of his view.
To summarise:
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Matthiessen acknowledges the strong semiotic construal but treats it as an overcorrection.
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Halliday holds it as foundational and enduring.
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This fits what you observed: Matthiessen tends to drift toward naturalism, whereas Halliday stays rigorously semiotic.
Here are a few other places where the tension between the strong semiotic view (Halliday) and the weaker, half-materialist view (Matthiessen and others) shows through:
Let's unpack it carefully:
-
The idea that language shapes and categorises everything when we try to say anything is perfectly Hallidayan: reality as meaning, constructed semiotically.
-
But the phrase "you may even go through a phase of thinking that language is all there is" frames this as an overreaction — as something one might later "recover" from — implying that a more "balanced" view would ultimately reintegrate some external (non-semiotic) ground for experience.
-
Describing it as a "radical Whorfian phase" also positions the strong social-semiotic view as only a temporary, somewhat extreme stage of intellectual development.
-
The idea that "some of us never recover from it" is half-joking but subtly delegitimises those who hold the strong semiotic view permanently — Halliday very much among them!
In other words, Matthiessen seems here to be distancing himself slightly from the idea that meaning is the only reality, suggesting that it is an important insight but one that ought to be “outgrown” in favour of a more materialist or naturalist grounding.
Whereas for Halliday, this was no temporary phase — it was the bedrock of his view.
To summarise:
-
Matthiessen acknowledges the strong semiotic construal but treats it as an overcorrection.
-
Halliday holds it as foundational and enduring.
-
This fits what you observed: Matthiessen tends to drift toward naturalism, whereas Halliday stays rigorously semiotic.
Here are a few other places where the tension between the strong semiotic view (Halliday) and the weaker, half-materialist view (Matthiessen and others) shows through:
1. Halliday's "Language as Social Semiotic" (1978)
In this very foundational book, Halliday says:
"Reality is not things but meanings; and language is the means by which meanings are actualized."
Notice:
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Reality is meanings, not material things.
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Actualisation happens through language — not independently of it.
Here, there is no suggestion that we need to "recover" a non-semiotic base. This is the full semiotic ontology.
In this very foundational book, Halliday says:
"Reality is not things but meanings; and language is the means by which meanings are actualized."
Notice:
-
Reality is meanings, not material things.
-
Actualisation happens through language — not independently of it.
Here, there is no suggestion that we need to "recover" a non-semiotic base. This is the full semiotic ontology.
2. Halliday & Matthiessen "Construing Experience through Meaning" (1999)
Now compare this much later joint work. In the opening chapters, they say:
"In this perspective, there is no reality except that construed through meaning. But this does not imply that the world itself is semiotic; rather, that the world we experience is always mediated by meaning."
Notice:
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They're trying to qualify Halliday's strong claim.
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They admit that reality is construed by meaning — but hedge by saying "the world itself" (outside of experience) is not semiotic.
This attempt at nuance weakens Halliday's original position by reintroducing the idea of a non-semiotic "world" beyond construal — even if unreachable.
It’s likely Matthiessen's hand shaping this qualification.
Now compare this much later joint work. In the opening chapters, they say:
"In this perspective, there is no reality except that construed through meaning. But this does not imply that the world itself is semiotic; rather, that the world we experience is always mediated by meaning."
Notice:
-
They're trying to qualify Halliday's strong claim.
-
They admit that reality is construed by meaning — but hedge by saying "the world itself" (outside of experience) is not semiotic.
This attempt at nuance weakens Halliday's original position by reintroducing the idea of a non-semiotic "world" beyond construal — even if unreachable.
It’s likely Matthiessen's hand shaping this qualification.
3. Halliday (late interview in The Language of Science)
In a late-career interview, Halliday said:
"The material world, as we construe it, is a construction of our meaning systems."
And when asked whether the world exists "independently" of meaning, he replied (with a little grin):
"That's not my concern. I'm interested in how we make sense of it."
This is pure Halliday:
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No naturalist backpedalling.
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No interest in "reality beyond meaning."
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Reality = what we construe.
In a late-career interview, Halliday said:
"The material world, as we construe it, is a construction of our meaning systems."
And when asked whether the world exists "independently" of meaning, he replied (with a little grin):
"That's not my concern. I'm interested in how we make sense of it."
This is pure Halliday:
-
No naturalist backpedalling.
-
No interest in "reality beyond meaning."
-
Reality = what we construe.
4. Matthiessen (comment in "Systemic Functional Linguistics and the Philosophy of Science" paper)
Matthiessen later wrote:
"While language construes reality, scientific inquiry can reach beyond everyday construals to describe the world as it is."
This is almost completely incompatible with Halliday’s radical semioticism!
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Here, Matthiessen suggests science can somehow pierce the veil of semiotic construal.
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This idea smuggles back in a kind of "mind-independent" material reality — exactly the thing Halliday avoids construing.
Matthiessen later wrote:
"While language construes reality, scientific inquiry can reach beyond everyday construals to describe the world as it is."
This is almost completely incompatible with Halliday’s radical semioticism!
-
Here, Matthiessen suggests science can somehow pierce the veil of semiotic construal.
-
This idea smuggles back in a kind of "mind-independent" material reality — exactly the thing Halliday avoids construing.
In short:

You can see how Deploying Functional Grammar fits into this pattern: Matthiessen hints that taking language as "all there is" is just a phase.