Cognitive Scaffold

Preparing your thinking workspace

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MENTAL MODEL · M5983

Grue and Bleen

Grue and Bleen
StructureHigh supportLogic
Included
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

Define the color "Grue": observed green before time T, and blue after time T. All emeralds we have seen so far support both "emeralds are green" and "emeralds are grue". So why do we predict they will be green in the future, rather than turning blue?

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

The language-dependence of prediction. Our predictions about the future depend on the linguistic concepts we use ("green" or "grue"). If our conceptual system itself includes a temporal shift (grue), then the same evidence leads to completely different predictions.

anchor

Anchor fast decisions

Goodman's paradox: green projects all emeralds as green, while grue (green before noon, blue after) fits past observations equally well but predicts the opposite, exposing the problem of the justification of induction.

MINIMUM ACTION

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Source support: Explicit

  • link
    en.wikipedia.orghttps://en.wikipedia.org/wiki/New_riddle_of_inductionZH · Explicit
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