Think again about the experiment with two holes… might we regard the whole double‑slit experiment and the electron — all of the electrons? — as part of a single quantum system? Maybe the electron knows which holes are open because the state of the holes is also part of the state of the electron.— John Gribbin, Six Impossible Things, pp. 24–25
At the close of his chapter on entanglement, Gribbin returns to the two‑slit experiment. On the surface, this feels like a gesture of consolidation: the chapter’s conceptual machinery is being brought back to bear on the experiment that opened the book. But the passage is doing something more revealing. It stages, in miniature, a moment of near‑coherence — and then performs a rapid ontological retreat.
That movement is worth examining carefully, because it exemplifies a distinctive form of explanatory strain.
A moment of relational clarity
Gribbin begins by asking whether the whole experimental arrangement might be treated as a single quantum system. This is not a trivial suggestion. It acknowledges, however briefly, that what is observed in the two‑slit experiment cannot be attributed to the electron alone. The configuration of holes matters; the experimental setup matters; the phenomenon depends on how the situation is arranged.
At this point, the familiar object‑centred picture wobbles. The electron no longer looks like a self‑contained bearer of hidden properties. The experiment itself begins to appear as the relevant unit of analysis.
For a moment, the mystery loosens its grip.
The recoil
But Gribbin does not stay there. Almost immediately, the apparent relational insight is pulled back inside the electron:
Maybe the electron knows which holes are open because the state of the holes is also part of the state of the electron.
This sentence performs a decisive reversal. What had briefly been allowed to stand as an external configuration — the arrangement of the apparatus — is re‑described as an internal feature of the particle. The relation is not permitted to remain a relation. It must be absorbed.
The experiment is acknowledged only on the condition that it can be re‑internalised.
Why this move feels natural
This recoil is not a personal failing on Gribbin’s part. It reflects a deep background commitment shared by most mainstream interpretations: that explanations ultimately take the form of what the thing is like. If the setup matters, then — on this view — it must matter by being represented somewhere, typically as part of the system’s state.
Relations, on this picture, are tolerable only insofar as they can be redescribed as internal structure.
The cost of refusing this move would be high. If the state of the electron does not already encode the experimental context, then the electron ceases to be a well‑defined object with determinate properties. And that, for much of the interpretive tradition, is a bridge too far.
The explanatory strain
The strain arises because Gribbin is pulled in two incompatible directions at once:
The phenomenon plainly depends on the experimental configuration.
The ontology he is working with permits explanations only in terms of particle states.
The result is a conceptual oscillation. The experiment is briefly allowed to matter — and then it is collapsed back into the electron, as if relation itself were intolerable unless it could be internalised.
This oscillation keeps the mystery alive. The electron still appears to “know” something it should not know. The explanatory pressure is merely displaced, not relieved.
A relational alternative
From a relational ontological perspective, the retreat is unnecessary. The experimental setup need not be treated as a state of the electron at all. It belongs to the structured potential within which particular phenomena are actualised. What appears on the screen is not the manifestation of an electron carrying encoded information about holes, but the instantiation of a particular construal — a perspectival cut through a field of possibilities.
Nothing needs to be hidden inside the particle. Nothing needs to travel. Nothing needs to know.
The central mystery dissolves not through new dynamics or exotic connections, but by refusing the demand that relations be re‑described as properties of things.
What this passage reveals
Gribbin’s closing gesture is revealing precisely because it almost escapes the problem it seeks to explain. The moment he acknowledges the relevance of the experimental configuration, the mystery begins to thin. The moment he re‑internalises that configuration into the electron, it returns in full force.
The explanatory strain here is not accidental. It is the visible trace of an ontology straining to accommodate relations without letting them be fundamental.
Seen in this light, the passage does not deepen the mystery of the quantum world. It quietly exposes where the mystery is being manufactured.