By this stage in the historical arc, three facts are clear:
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Classical physics appeared to support an ontology of intrinsic properties.
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Early modern metaphysics introduced a sharp subject–world separation.
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Quantum theory undermines the classical assumption of context-free definiteness.
Yet the deeper issue is not simply that classical ontology has been challenged. The deeper issue is that realism itself became identified with that ontology.
This identification was not logically required.
It was historically constructed.
1. Realism Before Independence
As shown in the earlier parts of this series, pre-modern philosophy did not define realism as ontological independence from observation.
For traditions shaped by thinkers such as Aristotle and Thomas Aquinas, reality was understood as structured, intelligible, and ordered. Objects were not conceived as isolated intrinsic atoms of existence. They were understood within networks of causation, form, and relational structure.
Realism, in these frameworks, meant that the world possesses determinate structure that constrains inquiry.
It did not require the metaphysical thesis that reality must exist independently of all conditions of knowing.
Thus the independence doctrine was not the original meaning of realism.
It was a later development.
2. The Cartesian Reconfiguration
The decisive shift occurs with René Descartes.
By introducing a radical division between thinking substance and extended substance, Descartes restructured the philosophical landscape. The knowing subject became ontologically distinct from the physical world.
This separation generated a new problem: how can knowledge reach an external reality if that reality exists entirely outside the sphere of thought?
In this context, independence begins to function as a safeguard. If the world is not independent of thought, scepticism threatens to dissolve objectivity.
Thus independence becomes associated with realism.
But this association arises from a specific epistemological crisis — not from the intrinsic meaning of realism.
3. Newtonian Reinforcement
When the physics of Isaac Newton achieved extraordinary predictive success, the Cartesian framework appeared confirmed.
Classical mechanics described a world of:
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bodies with determinate properties
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motion governed by mathematical laws
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measurements revealing pre-existing values
Because the theory worked so well, its metaphysical background was taken to reflect the structure of reality itself.
Independence ontology became naturalised within scientific discourse.
Realism was increasingly understood as commitment to intrinsic, observer-independent properties.
But this was a philosophical interpretation layered onto physics — not something the equations themselves demanded.
4. The Rise of Scientific Realism
In the twentieth century, philosophers defending the objectivity of science responded to anti-realist positions.
Thinkers such as J. J. C. Smart, Hilary Putnam, and Richard Boyd argued that the success of science would be miraculous if theories were not approximately true.
The resulting No Miracles Argument strengthened realism.
However, in defending realism, many philosophers assumed that realism required commitment to:
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mind-independent entities
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intrinsic properties
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fully determinate states of affairs
Thus realism became equated with independence ontology.
The equation hardened.
Yet it was never logically demonstrated.
It was inherited.
5. Quantum Theory Exposes the Conflation
With the development of quantum mechanics, especially under the influence of figures such as Niels Bohr and Werner Heisenberg, the classical ontology of intrinsic properties began to fail.
Results such as the Kochen–Specker theorem demonstrate that it is impossible to consistently assign non-contextual values to all observables in a quantum system.
The implication is not merely technical.
It strikes directly at the assumption that physical systems possess context-independent intrinsic properties.
If realism requires intrinsic properties, then quantum theory challenges realism.
But if realism does not require intrinsic properties, the threat dissolves.
6. The Misidentification Revealed
Here the historical pattern becomes clear.
Realism originally meant commitment to structured reality that constrains inquiry.
Over time, under the combined influence of Cartesian dualism and Newtonian mechanics, realism became identified with ontological independence.
This identification was never proven.
It was gradually absorbed as background assumption.
Quantum theory now reveals that the independence assumption is not required by physics.
Therefore:
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Independence is not logically equivalent to realism.
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Realism does not entail intrinsic properties.
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The two concepts were historically conflated.
The misidentification is exposed.
7. A Clear Distinction
We can now state the distinction precisely.
The first is a metaphysical thesis.
The second is an epistemic-ontological commitment grounded in explanatory practice.
They are not identical.
They were never identical.
Their conflation was a historical development — not a logical necessity.
8. Why This Matters
Once the misidentification is recognised, the debate changes shape.
The question is no longer:
Realism or anti-realism?
It becomes:
What conception of realism best fits the structure of modern science?
If quantum theory undermines intrinsic properties, then realism must be reformulated.
Not abandoned.
Reformulated.
9. Transition to the Future
Having exposed the historical conflation, the series now reaches its constructive moment.
If realism does not require independence, then it can be reconstructed in structural terms.
And once structural realism is clarified, the path opens toward a fully relational ontology — one that integrates the lessons of physics without importing the metaphysical assumptions of early modern philosophy.
The next step is therefore not demolition, but reconstruction.
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