Architecture · one design, — lenses · every figure read from this kit’s own run records
Your data is labelled.
Nobody has checked the labels in three years.
A data store carries a label that says how sensitive it is. Two other systems read that label to decide what to do — one masks the sensitive spans inside a document, the other decides who may open it at all. Neither of them ever checks whether the label is true. This is the whole of the system that does, drawn once as — boxes, and read — ways. Pick a lens. The boxes stay where they are.
Start here · 90 seconds
Welcome. Press Play and the page walks itself.
What this is
One worked question — “is this store labelled correctly?” — and the whole of the system that answers it. Every figure you will see is read from this kit’s own run records, not typed onto the page.
What you are about to watch
It moves stop by stop. The — boxes never move: each stop lights the ones it is about, redraws the band underneath to whatever that lens measures, and says in words what just happened.
Why — lenses
Because — things are worth saying and a flow chart has an axis for none of them: what the two labels are, what the evidence was, what was already free, which half of the guardrail the money actually moved, what the system refuses to do, and what a wrong label breaks downstream. That count is this use case’s number, not a fixed one.
What you should come away knowing
The paid call found — contradictions where a free rule that opens nothing found —. And it is not clean: one store was cut off mid-answer, counted wrong, and left in the denominator rather than re-run. That is published, not hidden.
Play runs the stops of the lens you are on · ← → step one at a time · pick any lens on the rack below to jump to it · — boxes open a second level — the sample pack and the prompt.
— boxes open a second level — use a button, or double-click the box.