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Lights and Shadows

ciechanow.ski Books & learning Tutorials & guides Mathematics & science Candidate
Screenshot of ciechanow.ski captured 2026-07-20
Page preview · captured 2026-07-20

Resurfaced independently across 4 calendar years, with breakout response in 2 of them.

submissions
4
submitters
4
observed span
2020–2026
peak thread · 32 comments
386 pts
latest 20+ return · 2026-01-02
241 pts

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

First comments on top threads

HN comment order

I love the format of interactive educational documents, especially when you can tell that the 'teacher' is also the UI designer and developer in one and there's a very high level of quality and polish. There's nothing quite like it for learning a complex subject. Check out the archives [1] for more amazing interactive documents by this author. Can anyone share any more examples of this kind of thing? The OP's archives [1] are amazing. [1] https://ciechanow.ski/archives/

I skimmed the source code (base.js, light.js) to see what he was using. It appears to be entirely custom, with no graphics libraries like Three.js. He even implements his own low-level math functions from scratch. It's impressive to see that kind of discipline.

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

Breakout years
2

100+ points or 50+ comments

Total points
633

reference only — not used in Hall rules or ranking

Total comments
60

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2020-07-01Lights and ShadowsFirst breakout · Best threadrobert-boehnke38628
2024-05-14Light and Shadows (2020)thunderbong20
2025-10-16Lights and Shadowsamelius40
2026-01-02Lights and ShadowsLatest 20+ point returnkg24132