Modern discussions of scientific realism often begin from a seemingly obvious assumption: reality exists independently of observation, perception, and conceptual framework. Realism, in this sense, is taken to mean that the world possesses a determinate structure entirely unaffected by the conditions under which it is known.
Because this assumption feels intuitive today, it is often treated as philosophically inevitable. Realism appears to demand independence.
Historically, however, the situation is quite different.
For much of the history of philosophy, reality was not understood as a domain that stands entirely apart from the conditions under which it becomes intelligible. The identification of realism with ontological independence is a comparatively recent development, emerging only with the metaphysical transformations of the early modern period.
To understand how this identification arose, it is useful to begin with the earlier traditions that preceded it.
Reality in Classical Philosophy
In ancient philosophy, the relationship between things and the conditions under which they are known was rarely conceived as a radical separation.
Consider the metaphysics of Aristotle.
For Aristotle, substances possess stable forms that make them the kinds of things they are. But these forms are not isolated intrinsic kernels existing independently of all relations. Substances are intelligible through their organisation within a wider network of relations: causes, powers, activities, and purposes.
A thing’s identity is therefore inseparable from the roles it plays within the structured order of nature.
Knowledge, in this framework, does not require access to a perspective-free reality detached from all conditions of inquiry. Instead, knowledge consists in grasping the form or structure that makes a thing what it is within the broader organisation of the world.
Reality, in other words, is intelligible through structure.
The idea that reality must exist in total independence from the conditions of knowing it would not have appeared as the natural definition of realism.
The Medieval Continuation
Medieval philosophy extended this broadly relational picture.
Scholastic thinkers such as Thomas Aquinas developed detailed accounts of relations as genuine features of reality rather than merely mental constructs.
Relations were not treated as secondary connections between already complete entities. They were understood as ways in which beings are ordered to one another within a structured cosmos.
Knowledge itself was therefore not conceived as the passive recording of intrinsically defined objects. It involved the intellect’s participation in the intelligible structure of the world.
Although medieval philosophy affirmed that the world exists independently of individual minds, it did not treat independence from all conditions of intelligibility as the defining feature of reality.
Reality remained fundamentally structured and relational.
The Absence of the Modern Problem
Because these earlier traditions did not begin from a radical separation between subject and world, they also did not confront the modern philosophical problem of how knowledge can reach a reality that supposedly exists entirely outside the conditions of knowing.
The very formulation of that problem presupposes a metaphysical picture in which the knowing subject stands on one side and a fully self-contained world stands on the other.
That picture had not yet taken shape.
Instead, reality and intelligibility were understood as mutually articulated: the world possessed an intelligible order, and knowledge consisted in grasping that order.
This view left ample room for realism. The world was not dependent on human thought, nor was it reducible to perception. But realism did not require the claim that reality existed in complete independence from the relational structures through which it becomes intelligible.
The Historical Turning Point
The identification of realism with ontological independence emerges much later, in the philosophical transformations of the seventeenth century.
It is in the work of René Descartes that we find the decisive reconfiguration. Descartes sharply separates the thinking subject from the extended world, introducing a new metaphysical picture in which the mind and the physical universe occupy fundamentally distinct domains.
Once this division is established, the question of how knowledge reaches an external reality becomes unavoidable.
From that point onward, independence begins to function as the defining feature of realism. Reality must be what exists outside the sphere of thought.
This shift marks the beginning of the modern conception of realism.
A Contingent Beginning
Seen in historical perspective, the independence doctrine no longer appears inevitable.
It is the product of a particular philosophical transformation rather than the natural meaning of realism itself.
For earlier traditions, reality was already understood as structured and intelligible through relations. The world was real not because it existed outside all conditions of knowledge, but because its structure constrained and guided inquiry.
The modern equation of realism with independence therefore represents a departure from earlier metaphysical frameworks.
Understanding how this shift occurred is essential for evaluating whether the doctrine it produced remains necessary today.
The next stage of the story begins with the philosophical revolution that made independence appear indispensable.
And that revolution begins with Descartes.
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