Lab
The index.
11 experiments, 2026-09 to 2026-09. A folder in the repository is all one needs. Listed ones appear here; unlisted ones only have a URL. Everything runs in the browser, nothing is tracked, nothing is stored.
Software development
Colour, motion, concurrency and the tools around the work.5- SpringDesign a SwiftUI spring by response and damping, watch it settle, and copy the same motion as SwiftUI, CSS linear(), Compose or Framer Motion.tool 2026-09-09
- Claude Code, from zeroNine chapters from install to ready, each with a do-it-now checklist you run on your own repo. CLAUDE.md, prompts, the workflow, models and effort, rules, skills, agents and hooks, with a prompt grader and a final readiness check.tool 2026-09-08
- ActorsSwift actor isolation, drawn as rooms with doors. One task inside at a time, the rest wait outside, and every await opens the door again.toy 2026-09-06
- EasingA cubic-bezier editor. Shape the curve, watch the motion, copy the CSS. The motion tokens of this site came out of it.tool 2026-09-06
- OKLCH rampPick a hue and a chroma, get a perceptually even ramp and the CSS to paste. The tokens of this site were built with it.tool 2026-09-05
Finance
Danish kroner, and where they actually go.2- RealkreditTo boliglån ved siden af hinanden: kurs, bidrag i intervaller, banklånet oven på de 80 procent og rentefradraget. Fast mod flex, med og uden afdrag.tool 2026-09-19
- Topskat 2026Where the Danish tax brackets bite. Salary in, take-home out, with the marginal rate at every krone and the distance to the next bracket.tool 2026-09-17
Training
Barbells, and the arithmetic around them.2- Programme5/3/1, Texas Method or a linear progression from your four maxes, every set already rounded to the plates you own. Print it, or send the link.tool 2026-09-18
- PlatesType a weight in kg, see which plates go on the bar, heaviest at the collar. Tell it what you own and it works around it, with a warm-up ramp thrown in.tool 2026-09-07
Games
Small rules, left alone, doing something you did not write.2- BoidsA flock from three rules. Turn separation, alignment and cohesion up and down, chase it with the pointer, and watch order appear from nothing.toy 2026-09-10
- LifeConway's game, because every lab needs one. Paint cells, drop in a glider gun, and watch newborns age from yellow to blue.toy 2026-09-07
Planned
Written down, not written yet.- ConcurrencyWrite a small Swift program with tasks and actors, watch it run as rooms and doors.toy · soon
- RegexA pattern as a railroad diagram, matching as you type.tool · soon
- TimestampUnix, ISO and Copenhagen local, in every direction.tool · soon