The Tacit Dimension

Michael Polanyi, 1966

Author: Shashank Heda, MD | Dallas, Texas

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NousSapient.com

Introduction

There is a moment every physician knows but rarely speaks about. Not
in rounds, not in grand rounds, not in the literature. You are looking
at a slide-a biopsy, a scan, a set of numbers-and something pulls. Not a
protocol. Not a checklist. Something older and quieter. You know before
you know why. The diagnosis arrives ahead of its own justification, like
a word you recognize before you can define it.

Michael Polanyi, a physical chemist turned philosopher who watched
twentieth-century science from the inside, gave this phenomenon its most
precise name. ���We can know more than we can tell.��� Six words.
Fifty-eight years later, they remain the most accurate description of
what expertise actually is-and what formal systems perpetually fail to
capture.

Who Should Read This

• Physicians trusting unexplained instincts

• Leaders whose judgment resists articulation

• Educators designing skill-transfer programs

• AI builders confronting knowledge limits

• Anyone who has learned by watching

Why Should They Read This

• Names what you already know

• Defends expertise against reduction

• Explains tacit skill transmission

• Diagnoses AI knowledge failure

• Restores dignity to intuition

Theme 1: The Primacy of Tacit Knowledge

Polanyi���s opening move is surgical. He does not argue that tacit
knowledge exists alongside explicit knowledge-as a supplement, a
footnote, a softer version. He argues that tacit knowledge is primary.
All explicit knowledge rests on a tacit foundation. You cannot codify
your way down to bedrock. The bedrock is already tacit.

The mechanism is what he calls the ���from-to��� structure of attention.
When a physician palpates an abdomen, she is not attending to the
pressure of her fingertips. She is attending from the fingertips to the
organ beneath. The fingertips are tools-invisible in use, noticed only
when they fail. This is focal awareness (the diagnosis) built on
subsidiary awareness (the sensation). Focal and subsidiary cannot be
swapped. Attend to the fingertips and you lose the diagnosis. The moment
of awareness is irreversible.

This matters enormously for how we build systems. Management
consulting spent decades trying to codify best practice. Electronic
health records attempted to make medicine explicit, auditable,
reproducible. Both produced voluminous documentation and, in many cases,
degraded the performance they were trying to capture. Polanyi tells us
why. You cannot make the subsidiary focal without destroying the
skill.

Theme 2: Personal Knowledge and the Myth of
Objectivity

Here is where Polanyi becomes genuinely disruptive-not contrarian for
effect, but structurally subversive. Modern science built its authority
on the claim of impersonal knowledge: the knower removed from the known,
the observer scrubbed from the observation. Polanyi calls this the
���epistemic ideal of objectivity.��� Then he shows it is incoherent.

All knowledge is personal knowledge. Not in the sense of being
arbitrary or merely subjective-but in the irreducible sense that a
knower is always involved, always bringing a trained body, a practiced
attention, a set of commitments the knower cannot step outside of. The
scientist who ���sets aside��� her prior beliefs is not achieving
objectivity. She is deploying a specific kind of tacit discipline-itself
personal, acquired, and inarticulate.

This does not collapse into relativism. Polanyi is not saying all
claims are equally valid. He is saying validity requires a knower who
has earned the right to make the claim-through apprenticeship, through
practice, through the long acquisition of subsidiary skills that cannot
be transmitted through text alone. Epistemic responsibility is personal,
not procedural. That distinction is load-bearing.

Theme 3: The Transmission Problem

If you cannot fully articulate tacit knowledge, how does it travel?
This is Polanyi���s most urgent practical question, and his answer is the
one most institutions have spent the last fifty years refusing to
accept: tacit knowledge travels through embodied apprenticeship, not
through documentation.

A student learns to dissect by dissecting beside someone who already
knows how to dissect. A junior consultant learns to read a room by
watching a senior consultant read rooms, hundreds of times, with no
explicit commentary. The master���s body is the curriculum. This is not
inefficiency. This is the only channel through which certain knowledge
can pass.

What breaks this channel? Standardization that severs the
apprenticeship relationship. Scalability demands that replace embodied
transmission with recorded lectures. Performance metrics that measure
outputs while the inputs-the subsidiary habits of excellent
practitioners-remain invisible and unprotected. We have been
disassembling tacit transmission infrastructure for decades while
wondering why expertise is becoming rare.

Theme 4: Emergence, Integration, and the Whole That Exceeds
Its Parts

Polanyi extends his analysis into biology and perception with the
concept of integration. When we recognize a face, we are integrating
thousands of subsidiary details-each individually insufficient-into a
coherent focal awareness. The face is not the sum of the features. The
face is what emerges when the features are held together in a particular
way. This is gestalt, but Polanyi gives it epistemological weight rather
than perceptual description.

The implication for organizational knowledge is profound. When an
experienced team functions well, what they know collectively cannot be
reconstructed from individual knowledge inventories. The team���s
competence is an emergent integration-held together by shared subsidiary
attunements that were never made explicit and cannot be reinstalled from
documentation after disruption. This is why knowledge transfer projects
so frequently fail. They transfer the focal. They cannot transfer the
subsidiaries that hold it up.

Theme 5: The Boundary Conditions-Where Polanyi���s Framework
Strains

Polanyi���s framework is not without its fracture lines. Acknowledge
them-because an analysis that presents only strengths does not survive a
serious reader.

First, the conservative implication. If tacit knowledge is acquired
through apprenticeship, and apprenticeship requires access to masters,
then Polanyi���s epistemology implicitly privileges those with access. The
physician who trained at a high-volume center under extraordinary
diagnosticians acquires tacit knowledge the rural trainee does not.
Polanyi describes this asymmetry. He does not resolve it.

Second, the AI challenge. Large language models have now demonstrated
that certain performances previously believed to require tacit
knowing-pattern recognition in imaging, legal document analysis,
clinical note interpretation-can be reproduced through statistical
learning at scale. This is not a refutation of Polanyi. It is a genuine
complication. The question is not whether AI can perform these tasks,
but whether what it performs is the same kind of knowing-or a
sophisticated imitation whose failure modes are structurally different
and as yet incompletely mapped. That question remains genuinely
open.

Third, the tacit can be wrong. Experienced clinicians carry tacit
biases-diagnostic anchoring, pattern-recognition errors in unfamiliar
populations-that are not corrected by further apprenticeship but require
explicit disruption. The subsidiary can be miscalibrated. Polanyi���s
reverence for the tacit does not fully account for its corruption.

The Daoist concept of wu-wei-effortless action arising from deep
alignment with the nature of things-maps cleanly onto Polanyi���s tacit
knowing. The master craftsman of Zhuangzi���s famous cook does not think
about the ox. He has internalized the ox. The knife finds the natural
cavities without effort. This is not mysticism. It is the phenomenology
of expertise: the subsidiary so thoroughly integrated that focal
attention is freed for the highest-order task. Polanyi and Zhuangzi
arrived at the same architecture from opposite directions, separated by
twenty-five centuries.

Closing: The Question We Cannot Fully Answer

At Nous Sapient, this text surfaced a discomfort we are still inside.
We have spent significant effort building evaluative
frameworks-structured methodology, named categories, diagnostic
protocols-for the Micro Reading Book Club. The aim: to make reading more
rigorous, more transferable, more governable. Polanyi sits across from
that project and asks a question we cannot dismiss: in the act of making
reading explicit and systematic, are we destroying the very thing we are
trying to protect?

The old professor in Nagpur who made me read aloud, corrected my
pauses, had me re-read the paragraph I thought I understood-he was not
teaching reading. He was transmitting subsidiary attunements that I
could not have named then and cannot fully name now. Whatever I am able
to do with a text arrived through him, through embodied attention over
years, not through a framework I could hand to someone else intact.

Polanyi does not tell us to abandon our structures. He tells us to
hold them as tools-attended from, not attended to. The framework that
becomes the object of attention is already failing. The framework that
becomes invisible in use, freeing the reader���s focal awareness for the
text itself, is doing what it is supposed to do.

I leave one question open, as this text demands. We are in a moment
of extraordinary confidence in explicit systems-in AI that reads, in
protocols that govern, in platforms that scale. All of it rests, Polanyi
would say, on a tacit substrate we are not measuring and are possibly
eroding. What happens when we have optimized every process and lost
every master?

We can automate the explicit. We cannot automate the
knowing that makes the explicit mean anything.

~1,100 words