Modern physics is widely assumed to rest on a simple ontological premise:
Reality is what exists independently of observation, perception, or description.
At first glance the claim appears both obvious and harmless. Science, after all, seeks to understand a world that is not simply invented by observers.
Yet when examined carefully, this premise proves deeply unstable. The difficulty is not merely philosophical. It generates persistent confusion in the interpretation of physics itself.
The problem emerges once we examine what the assumption actually requires.
1. The Ontological Claim
The independence assumption asserts the following:
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Reality exists.
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Reality exists independently of observation or description.
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Physics describes that reality.
The structure seems straightforward. But the moment we consider how physics actually operates, tension appears.
Physics does not access reality directly. It operates through:
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measurement
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experimental apparatus
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mathematical modelling
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theoretical interpretation
All of these are forms of construal — structured ways of distinguishing and describing phenomena.
Thus physics can only encounter the world through organised acts of construal.
2. The Epistemic Situation
This leads to a simple but unavoidable observation:
All knowledge produced by physics is knowledge produced through observation, measurement, and theory.
There is no other access point.
Thus every statement physics makes about reality is already mediated by:
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experimental arrangements
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conceptual distinctions
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mathematical representations
In short:
Physics does not encounter an unconstrued world. It encounters phenomena structured by the practices of inquiry.
3. The Ontological Leap
The independence assumption now performs a crucial step.
From the fact that physics describes phenomena obtained through measurement and theory, it infers that these descriptions correspond to a reality that exists independently of any such practices.
But this inference has no logical justification.
From the existence of descriptions, one cannot infer the existence of a describable object that exists entirely independently of the conditions under which description becomes possible.
The assumption therefore introduces something that physics never encounters:
a reality defined precisely by its absence from experience.
4. The Conceptual Paradox
The difficulty now becomes sharper.
To say that reality exists independently of observation is already to describe that reality.
But descriptions themselves require:
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conceptual distinctions
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observational categories
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theoretical frameworks
Thus the claim describes a reality that is supposed to exist without dependence on the very distinctions used to describe it.
The ontology therefore depends on what it attempts to exclude.
In effect, it asserts:
reality exists independently of the conditions that make this statement meaningful.
5. The Operational Consequence
The problem might remain abstract if physics were able to ignore it in practice.
But modern physics repeatedly encounters situations where the separation between observation and phenomenon cannot be maintained.
Nowhere is this clearer than in quantum mechanics.
Quantum theory does not simply describe a system evolving independently of observation. Instead it predicts probabilities for outcomes that occur when specific measurements are performed.
The theory therefore links:
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the behaviour of the system
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the measurement arrangement used to investigate it
Attempts to describe what the system is doing independently of any measurement context produce the familiar paradoxes of quantum interpretation.
6. The Interpretative Crisis
The resulting situation is striking.
Quantum theory is extraordinarily successful in predicting experimental results. Yet there is no consensus about what the theory means.
Instead physics has produced a proliferation of incompatible interpretations, each attempting to reconcile the formalism with the assumption of an observer-independent reality.
Among them:
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the Copenhagen interpretation
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many-worlds theories
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hidden-variable theories
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objective collapse models
These interpretations differ radically, but they share a common aim:
to preserve the independence assumption.
The interpretative crisis of quantum mechanics therefore reflects not merely a problem in physics but a deeper instability in the ontology guiding its interpretation.
7. The Independence Assumption Reconsidered
At this point the central claim can be restated.
Physics does not encounter a reality that is independent of observation.
What it encounters are phenomena produced through structured interactions between experimental practices and the world.
The independence assumption attempts to move beyond these phenomena to a realm that is, by definition, inaccessible to observation, measurement, and description.
But such a realm cannot be meaningfully characterised.
The ontology therefore attempts to ground scientific knowledge in something that science can never encounter.
8. The Result
The consequences are now clear.
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Physics necessarily operates through acts of observation and description.
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The independence assumption declares that what is real lies outside those acts.
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Physics therefore attempts to describe a reality that its own ontology defines as inaccessible.
The result is a conceptual structure in which:
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observation is necessary for knowledge
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observation is declared irrelevant to reality
The independence assumption thus produces a persistent oscillation between two incompatible commitments.
Physics cannot abandon observation, but its ontology insists that reality must ultimately exclude it.
9. The Real Lesson
The difficulty is not that physics studies a world beyond individual perception. That much is uncontroversial.
The problem is the stronger claim that reality must exist independently of any perspective whatsoever.
Once stated clearly, this claim dissolves.
All scientific knowledge arises within organised perspectives — experimental, theoretical, and mathematical.
To speak meaningfully about reality is therefore always to speak from within such structures of construal.
The independence assumption attempts to remove those structures while continuing to rely upon them.
In doing so, it quietly undermines the very enterprise it was meant to secure.
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