First came Gutenberg, who unlocked words by taking them from the scribe’s hand and placing them in the machine. Recorded thought could now travel and persist. The work of the mind began to shift from preservation toward interpretation. Then came the internet, which unlocked facts. The library collapsed into a search box, and recall gave way to retrieval and synthesis. Knowledge became less something we carried and more something we could summon.

I've often said that large language models unlock thought itself. They generate content with a fluency that resembles understanding. The cognitive task appears to be shifting again, this time from synthesis toward thinking itself. The progression feels intuitive as each step moves closer to the core of cognition. Each technology seems to extend a deeper layer of mental work.

And yet, this last step feels different and even disconnected. It's not just more powerful, but different at a fundamental level. My sense is that we are no longer adding another rung to a ladder, but changing the basic structure itself.

Every previous cognitive technology functioned as an extension of an already-formed mind. Books extended memory. Indexes and search engines extended recall. Calculators extended arithmetic. Simply put, they were prosthetics for........

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