MENTAL MODEL · M4199

Leibniz's Mill

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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

A thought experiment: imagine the brain enlarged to the size of a mill, and you can walk inside and see gears and levers (neurons and synapses) in motion, but you will never find "perception," "desire," or "consciousness" itself within it.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Used to critique mechanical materialism's explanation of consciousness. It delineates the gap between physical mechanisms and subjective experience (qualia), and is a foundational metaphor for understanding the modern "explanatory gap" and the debate over AI consciousness.

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Even if the brain is enlarged and its physical operations are observed part by part, subjective experience (qualia) is still not found. There is a gap between the third-person perspective of physical description and the first-person perspective of consciousness that cannot be directly bridged by mechanisms.

MINIMUM ACTION

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Practice this model in one real situation:

When evaluating whether consciousness can be reduced to physical processes, first distinguish between function and experience. Use it as a thought experiment to test claims of "strong AI"
when discussing AI consciousness, remain sensitive to the qualia problem and do not equate function with experience.

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Source support: Explicit

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en.wikipedia.orghttps://en.wikipedia.org/wiki/Leibniz%27s_gapZH · Explicit
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