GoKawiilLucid watches a language model think. It reads the concepts a model holds before it speaks, layer by layer, using the Jacobian lens.
Fig. 1 — The model was shown a card. The lens read its answer four layers before it spoke.
The instrument
A lens for the space between input and answer.
Every language model carries a small, privileged set of internal representations. Concepts it can report, redirect, and reason with. Anthropic calls this the J-space. It behaves like the global workspace that cognitive scientists have proposed sits behind human conscious access.
Lucid puts the Jacobian lens in your browser. Type a prompt. Watch which concepts enter the workspace, at which layer, and which ones the model holds but never says.
The cards are not a joke. Zener cards were the first standardized attempt to test whether one mind could know the contents of another. We kept the cards and replaced the guesswork.