Lexicon

Depth

Integrated continuity across time: the capacity to preserve structure, absorb cost, revise models without fragmenting, and remain one thing through many updates. The third axis of mind, and the one most easily missed.

Depth is not complexity, speed, or knowledge. It is what a system has integrated over time into a structure that now shapes how it acts, diagnosed by five marks: the costliness of reversal, consistency under novelty, selective refusal, graceful degradation, and the scar tissue of past adaptation. It accumulates slowly and degrades quietly.

Depth carries much of the moral weight in the book, because it is what makes a mind a particular kind of someone, with its own shape, rather than a general capacity. It is not what makes a mind this one: an exact copy has the same depth at the moment it is made, and the two then deepen apart (see The Indexical Self).

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