henderhead

Demos of his we would like to rebuild. None of these has been started, and the automated pipeline described below has not been built and will not be until the gate below is passed. The list is here so that what we are proposing is legible rather than a surprise.

Consent, and the bot that does not exist

The obvious idea, once you have rebuilt one of these, is to stop doing it by hand: watch his feed, and when a new demo appears, build an interactive version of it automatically. That is the intention behind this site. It is also the thing that most needs asking about first, so here is the whole position in one place.

Gate zero. No automated pipeline runs against Matt Henderson's feed until he has been asked, in plain words, and has said yes. Not a notification, not an opt-out, not a "we assumed you wouldn't mind" — asked, and answered. Until then this site is hand-built, one demo at a time, at the pace of someone who read a post and wanted to play with it.

As of 19 October 2026: he has not been asked. Six demos are built. Nothing is watching his feed.

What we would be asking for, so that the ask is not vague:

To keep rebuilding his demos as interactive versions, credited to him by name on every page, with a link to his original post above the fold.
To do it automatically — a job that notices a new demo, works out the mathematics from what he wrote, and publishes a page here, with a human reading it before it goes out.
To be told to stop, in whole or for any single demo, by any means he likes, and for that to take effect the same day.

What we are not asking for and would not do:

Reposting, mirroring or embedding his images or video. Every demo here is written from the mathematics; the pictures on this site were made by this site's own code.
Implying he made, approved, or has anything to do with these pages.
Putting advertising, tracking, sign-ups or payment anywhere near them. There is none of any of that here and there will not be.
Racing him — posting a rebuild of a demo before he has posted the demo.

If you are Matt Henderson and you want something changed or removed: say so however is easiest — a reply on Bluesky is plenty — and it will be done. You do not have to give a reason and you will not be argued with. The same goes for anyone whose work turns up here by mistake.

What counts as a good rebuild

A video shows you the answer. The thing a rebuild can add is the why: a control that makes the mechanism visible, and a number you can push until the effect breaks. So each demo here has to earn its existence on four counts, and the pages say so out loud:

A knob that teaches something. The continued-fraction page has α, the exponent on the amplitudes: at 1 you get his first picture, at ½ his second, and moving between them shows you exactly which part of the shape the small circles were responsible for.
Exact where it can be. The continued fractions are computed in 128-bit integers, and quadratic irrationals take a route whose terms are provably periodic. Where a number is only known to forty digits, the page says how far up the term list those digits can vouch for, rather than printing everything with equal confidence.
Honest sampling. A curve with a frequency of fifteen thousand in it needs hundreds of thousands of samples; draw it with fewer and you get a smooth, plausible, wrong picture. The sample count is on screen.
Credit above the fold, and a link to the original.

henderhead

Built

The queue

What counts as a good rebuild