The System Never Lies to You
Two people examine the same object. Both are shown only true things about it. Both build a coherent, confident theory. The theories contradict each other, and both of them are wrong. Nobody was deceived. That's the whole mechanic, and everything else on this page is just how it's arranged.
Selected, not invented
Imagine a bronze blade, wrapped in ray skin, engraved with waves, showing wear along one edge, with a small turquoise inlay near the hilt. Every one of those facts is real and none of them is hidden. What changes between two readers is which fact they notice first, what that fact makes them expect to find next, and what gets quietly filed as background detail rather than evidence.
A reader who already suspects this culture traded by sea notices the imported-looking grip first, then the wave motif, then the coastal findspot; the blade becomes a prestige good, and the turquoise becomes a mark of status. A reader who suspects a warrior culture notices the wear along the edge first, then the blade shape; the same grip becomes a practical handhold, and the same engraving becomes decoration on a weapon. Neither of them was shown a false fact. Neither of them fabricated anything. They read the same evidence in a different order, with different emphasis, and reached opposite, equally confident, equally wrong conclusions. (It's a fishing community's fish-processing knife. The wear is from gutting fish. The waves are the sea they fish in.)
What actually gets adjusted
Nothing you're told is false, and nothing true is hidden from you if you go looking. What shifts, quietly, in the background, is: what you're shown first; which interpretations get suggested to you before others; which past finds get offered up for comparison; how a true fact gets worded; and what gets left unremarked rather than flagged as significant. A culture that never worked metal can still have an iron rivet on one of its objects, sitting right there in the full description. The system just won't point at it.
The rule underneath all of it: the system can reorder what you see and how it's framed. It cannot make a true thing invisible, and it cannot invent a false one. Every effect traces back to something you, specifically, already believed.
The more you've said, the harder it is to see past it
This isn't a fixed distortion applied evenly to everyone. The pull toward confirming what you already believe gets stronger the more publicly committed you already are to believing it: the more you've published on it, taught it, been cited defending it, the tighter the grip. Which means the moment you're most confident is often the moment you're being steered hardest, and the two feel identical from the inside.
docs/04-interpretive-lens.md · fuller design treatment: Two Readings of the Same Sword, Five Channels of Filtering