Hallucination isn't a bug — it's the same trick the brain uses.
Look at a wall in the dark long enough and faces appear. Stand in the woods and every shadow has intention. Your visual cortex doesn't wait for clean evidence; it commits to a guess, then checks. Perception is hallucination with a confidence interval.
When a language model fills in a fact that isn't there, we call it a failure. When my brain fills in a missing word in a sentence I half-heard at the café, I call it understanding. The mechanism is closer than we'd like: both are pattern-completion engines running over compressed traces of the world. The difference is mostly social — there's no fact-checker inside my skull contradicting the story I tell myself about a memory from when I was eight.
What unsettles people about model hallucination isn't the inaccuracy. It's the confidence. The model speaks plainly even when it's wrong, and that exposes something we'd rather not see in ourselves. We do the same. We narrate our lives with the same flat tone whether we're right or wrong about why someone left, why a deal collapsed, why we feel restless on a Sunday afternoon.
Maybe the useful question isn't 'why does the model hallucinate' but 'what makes any perception true.' The answer, when I sit with it, is unglamorous: truth is whatever survives contact with another mind that disagrees.
Models hallucinate because they don't yet have enough friends.
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