Throughout this series, a recurring theme has emerged.
Visual semiosis has often been analysed from below rather than from above.
The analyst begins with what is visible and then attempts to determine what it means.
From a Hallidayan perspective, however, visible forms are not the starting point of explanation. They are what require explanation.
This principle becomes particularly important when we turn to one of the most discussed features of visual semiosis: colour.
Few topics have generated more interpretive commentary.
Blue is said to signify tranquillity.
Red is said to signify danger.
Green is said to signify nature.
Black is said to signify authority.
White is said to signify purity.
Such claims are familiar enough that they often pass without comment.
Yet from a systemic-functional perspective, they raise an important theoretical question.
What exactly is being described?
Where Is Colour?
Before asking what colour means, we need to ask a simpler question.
Where does colour belong within the architecture of semiosis?
The answer is straightforward.
Colour belongs to the expression plane.
It is a visual resource through which semiosis is realised.
Whatever meanings may be associated with colour, colour itself is not meaning.
It is expression.
This distinction may seem obvious.
Yet visual analysis frequently proceeds as though colour and meaning were interchangeable.
The result is a continual slippage between content and expression.
The Problem with Colour Meanings
Consider a familiar example.
An analyst observes the colour blue and proposes that it signifies tranquillity.
At first glance, the interpretation appears reasonable.
But what has actually been established?
Certainly a colour has been identified.
And certainly a meaning has been proposed.
What remains unclear is the relation between them.
If blue literally means tranquillity, then tranquillity should be inseparable from blueness.
Yet this is obviously not the case.
A sense of tranquillity may be realised through:
muted colour palettes,
reduced visual contrast,
open spatial arrangements,
balanced compositions,
soft visual boundaries,
or many other expressive resources.
The meaning remains recognisable even when the colour changes.
This suggests that tranquillity cannot be identified with blue itself.
The colour belongs to expression.
The meaning belongs to content.
The Direction of Explanation
This distinction reveals a broader methodological issue.
Many analyses move from colour to meaning.
The reasoning proceeds roughly as follows:
Here is a colour.Therefore, what does it mean?
A Hallidayan approach reverses the direction.
The question becomes:
Here is a meaning.How is it realised?
Colour then becomes one possible expressive resource among many.
The explanatory priority shifts from expression to content.
Again, the view from above proves decisive.
The analyst is no longer asking what colours mean.
The analyst is asking how meanings may be realised chromatically.
Colour and Context
The difficulties become even clearer when context enters the picture.
The same colour may participate in very different meanings across different situations.
Red may be associated with warning in one context, celebration in another, political affiliation in a third, and aesthetic preference in a fourth.
Blue may evoke calmness in one setting and institutional authority in another.
These variations are often treated as exceptions.
From a systemic-functional perspective, they are exactly what we should expect.
Meaning does not reside in colour itself.
Colour participates in the realisation of meanings that are intelligible within particular contexts.
The contextual value remains primary.
The colour is one resource through which that value may be realised.
Colour and Choice
At this point an important objection may arise.
Surely colour choices matter.
A designer may deliberately choose blue rather than red.
A painter may deliberately construct a particular palette.
A photographer may deliberately seek particular chromatic effects.
Is this not evidence that colour itself carries meaning?
Not necessarily.
What it demonstrates is that colour functions as a semiotic resource.
A resource can be selected precisely because it is capable of realising particular meanings.
The existence of choice does not collapse the distinction between content and expression.
On the contrary, it presupposes it.
The expressive resource is selected because it is capable of realising a content value.
The Special Case of Photography
Colour becomes particularly interesting when we turn to photography.
A painter may choose to depict a blue sky.
A graphic designer may choose to create one.
A photographer, however, appears merely to record what is already present.
This appearance has encouraged the belief that photographic colour is somehow more natural and therefore less semiotic.
Yet the situation is more complicated.
Photographers choose:
where to point the camera,
when to take the photograph,
what lighting conditions to exploit,
how to expose the image,
how to process the result,
and increasingly, how to manipulate colour after capture.
The apparent transparency of photography conceals a substantial semiotic process.
Indeed, the assumption that photographs simply show reality may be one of the most powerful illusions in visual culture.
Beyond Colour Symbolism
The goal of a Hallidayan approach is therefore not to compile dictionaries of colour meanings.
Such projects begin from expression and attempt to work upward.
Instead, the task is to understand how colour functions within a broader semiotic architecture.
Colour is neither meaning nor reality.
It is an expressive resource.
Its significance lies in the meanings it may realise and the contexts within which those meanings become intelligible.
Once this distinction is maintained, many familiar debates about colour begin to look rather different.
The question is no longer:
What does blue mean?
The question becomes:
What meanings are being realised through this chromatic organisation, and how does colour participate in that realisation?
Looking Ahead
Colour provides a useful reminder that visual semiosis cannot be understood simply by inspecting visible forms.
Expression is not self-explanatory.
It becomes intelligible through its relation to content and context.
Nowhere is this lesson more important than in photography.
Photography has often been treated as though it bypasses semiosis altogether—as though the camera simply delivers reality directly to perception.
A Hallidayan perspective suggests otherwise.
The next post examines what might be called the transparency illusion: the belief that photographs merely show the world rather than participating in the semiotic organisation of meaning.
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