# 2 · Building a ruler

> Living preprint · as of 2026-10-25 · map node CH-ruler (chapter) · interim record, not a final result.

Chapter 2: Building a ruler (2026-10-01 → 10-03). Read it at https://r4topunk.github.io/boar-research/research/ruler.md.

## Outgoing

- led to: [CH-floor-trap] 3 · The floor trap → https://r4topunk.github.io/boar-research/map/ch-floor-trap.md

## Incoming

- led to: [CH-question] 1 · The question → https://r4topunk.github.io/boar-research/map/ch-question.md

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Cite as: r4to, independent researcher. RatLab — A Boar Research (2026), research record 1.0, as of 2026-10-25. Text and data CC BY 4.0. Fact ids or a link must travel with a quote. How to cite: https://r4topunk.github.io/boar-research/cite/ · https://r4topunk.github.io/boar-research/CITATION.cff.

AI-reviewed, not clinically reviewed. Nothing here is medical advice.