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The Book of Math — the world's first XR math textbook
Eighty theorems across four chapters, rendered as real LaTeX on Snap Specs and paged through like a book. An IoTone, Inc. #Lensfest August 2026 drop — and the proof that Matematex, our LaTeX library for SPECS, is finished enough to build on.
We dropped The Book of Math on r/Spectacles as a #Lensfest August 2026 submission — the world’s first XR textbook for math, visualized, plus a LaTeX library for SPECS. There’s a short demo video of the first edition, standing open in a room.
It is a book in the literal sense: 80 theorems across four chapters — Geometry, Algebra, Calculus and Linear Algebra — that you page through with a pinch, with a page-turn sound and a running 3/80 Pythagorean Theorem label. No scroll views, no tabs. Every formula is sourced from CC-licensed or public-domain material (ProofWiki, NIST’s DLMF, OpenStax, Wikibooks, LibreTexts) and credited on the About page.
The library underneath
The book is the demo. The deliverable is Spectacles-Matematex, the LaTeX parser and renderer for Snap Spectacles we started in July 2025 — and it has been finished the hard way.
LaTeX rendering on the web is built on DOM, canvas and SVG, none of which exist on Specs. So Matematex runs KaTeX unmodified on top of SpaceDOM, our off-screen DOM implementation, then walks the resulting tree into Lens Studio scene objects through SpaceSVG — both from the Polynode project. Two rejected alternatives and the comparison matrix that chose this one are written down in the design spec. Everything runs 100% on-device: no external service, no network call, no cloud LaTeX endpoint.
Getting there meant a per-formula visual defect catalog across all 80 formulas, a KaTeX font-metrics port, a proof grammar, and a long layout campaign. The integration guide names six Lens Studio traps that each cost a day and none of which produce an error message — that document alone is probably worth the repository.
Small things that matter
The page-turn sound is an 11.3-second recording of a book being turned over and over; each turn plays a random one-second window of it, so no two consecutive pages sound identical. The same transient replayed twenty times while paging through a chapter is exactly what makes an interface sound synthetic.
The sample lens is Matematex/ — open it in Lens Studio, enable the Phase 6 scene object, and it validates all 80 formulas on startup. Source, design docs, and the integration guide on github.com/IoTone/Spectacles-Matematex.