Invisible Ink

Building teaching tools with GenAI

The ink is invisible. The exercise is yours.

A university teacher can now build an interactive exercise that paper can't do, in an evening instead of a week. GenAI is the partner at the workbench: it suggests the lines, and the teacher draws them.

The students never meet it. What reaches the classroom is an ordinary web page, with no AI, no accounts and nothing leaving the browser.

The workbench · pick a station

A green cutting mat on a birch workbench, seen from above. In the middle, a pencil sketch of an exercise with three sliders and a bar chart. Around it, eight index cards, each with a small object: a compass, a folding rule, a wrench, coins, a padlock, a magnifier, a card index and a toolbox. A laptop in the corner shows the finished exercise. 00The exercise 01Why 02Workflow 03Tech 04Cost 05Privacy 06Quality 07Catalogue 08Get started —What students see
00

The exercise

In the middle is what is being built: a sketch of an exercise. The stations lie around it, each with its own tool.

The workbench photo is AI-generated (GPT Image 2.5 via Higgsfield). The exercises it points to are not.

Eight stations

Everything it takes, one question at a time

  1. 01WhyWhat can an exercise on screen do that paper cannot?
  2. 02WorkflowFrom a teaching idea to an exercise in use.
  3. 03TechWhat do I need, and how much do I have to know?
  4. 04CostSubscription, hosting, domain, and the real cost: time.
  5. 05PrivacyWhat leaves the student's browser, and what the GDPR asks.
  6. 06QualityAccessibility, subject accuracy and trying it on students.
  7. 07CatalogueExercises in use, with small examples to try.
  8. 08Get startedA template to take home: README, CLAUDE.md, deploy script.

Station 01 · The paper test

If paper can do it, use paper

An exercise earns its screen only if it uses at least one thing paper can't do. There are seven, and each keeps the name the research already gives it.

Stroop = RT + ARSAnchoring = A/B + ARSSegmentation = RWD + SIMMCQ = ∅MCQ + ARS = Peer Instruction

Read the paper test in full

Build time

Built with GenAI, and it shows in the history

Every exercise in the catalogue lives in a git repository. The numbers below are counted from those histories each time this site is published.

169commits across four sites since 20 August 2026
145of them list Claude as co-author
20psychology exercises, first commit to finished, in five days
0AI calls when a student opens an exercise
“An exercise that used to take a week of programming now takes an evening.”
From the teacher notes on psykologi.samle.dk

31 seconds

From the bench to the class

At the bench, hands of light help and the ink suggests the lines. The pencil traces them, and the glow goes out. In class, nothing glows.

AI-generated film (GPT Image 2.5 and Kling 3.0 via Higgsfield). No sound.

In use

Four sites, four audiences