One of Dutch artist M.C. Escher's works is a man is admiring a piece of art that itself depicts the building the (very same) man is in [0]. Escher left out the middle bit of the painting, probably since it's fairly complicated, putting his signature there instead. The video itself is about the complex analysis used to fill in that missing middle, based on a paper ~20 years ago.

[0] https://en.wikipedia.org/wiki/Print_Gallery_(M._C._Escher)

I think the gap also has a compositional purpose: the viewer's eye is meant to travel around the image in a circle, and the gap helps anchor that in a way that the filled-in version might not.

Hm, since I can't edit my comment: link to paper [0]

[0] https://pub.math.leidenuniv.nl/~smitbde/papers/2003-de_smit-...

HN only allows editing comments for a short time

I'll just leave this here: https://en.wikipedia.org/wiki/Association_of_German_National...

In my limited experience with static cards you really do just end up learning the "appearance" of a card, which is why I've been more successful with dynamic cards, like say a card showing a concordance randomly selected from a large corpus every review, showing the word I want to learn in various contexts.

Ha, looks like it's finally been flagged.

The aforementioned trapezoidal rule (Tai's method): https://diabetesjournals.org/care/article/17/2/152/17985/A-M...

You may enjoy this, from a top-down experimental perspective (https://www.nikonsmallworld.com/galleries/small-world-in-mot...). Only a few entries so far show intracellular dynamics (like this one: https://www.nikonsmallworld.com/galleries/2024-small-world-i...), but I always enjoy the wide variety of dynamics some groups have been able to capture, like nervous system development (https://www.nikonsmallworld.com/galleries/2018-small-world-i...); absolutely incredible.

Very interesting, thanks.

I suppose so, but this message from NOAA (https://www.ospo.noaa.gov/data/messages/2025/06/MSG_20250625...) shows a period of five days til shutdown, which seems extremely abrupt.

It's honestly impressive how efficiently and smoothly things are regressing.

It is easier to destroy than to create.

That "decadence" isn't the cause of the problems, but a symptom.

Not really a uniquely American thing. Not even a uniquely Western, nor uniquely "first world" activity.

Total apathy.

To add to this, non-exhaustively, from various other places including reddit:

Krennic's meeting on kalkite:

* structured like the https://en.wikipedia.org/wiki/Wannsee_Conference

* takes place at the https://en.wikipedia.org/wiki/Kehlsteinhaus

the Aldhani heist: https://en.wikipedia.org/wiki/1907_Tiflis_bank_robbery

Ferrix: https://en.wikipedia.org/wiki/The_Troubles

Vel Sartha:

* https://en.wikipedia.org/wiki/Rose_Dugdale

* https://en.wikipedia.org/wiki/Dolours_Price

* https://en.wikipedia.org/wiki/Red_Army_Faction

Kleya Marki: https://en.wikipedia.org/wiki/Noor_Inayat_Khan

the Dhanis: https://en.wikipedia.org/wiki/S%C3%A1mi_people#Discriminatio...

escape from Narkina 5:

* https://en.wikipedia.org/wiki/Maze_Prison_escape

* https://en.wikipedia.org/wiki/Mauthausen_concentration_camp

* https://en.wikipedia.org/wiki/Sobibor_uprising

* https://en.wikipedia.org/wiki/Vrba%E2%80%93Wetzler_report

Rix Road:

* https://en.wikipedia.org/wiki/Haymarket_affair

* https://en.wikipedia.org/wiki/Corporals_killings

* https://en.wikipedia.org/wiki/Shireen_Abu_Akleh#Funeral

Mon Mothma's speech: https://en.wikipedia.org/wiki/Otto_Wels#Speech_in_opposition

Ghormans: https://en.wikipedia.org/wiki/French_Resistance

Ghorman massacre:

* https://en.wikipedia.org/wiki/Bloody_Sunday_(1972)

* https://en.wikipedia.org/wiki/Tlatelolco_massacre

* https://en.wikipedia.org/wiki/Jallianwala_Bagh_massacre

* https://en.wikipedia.org/wiki/Rabaa_massacre

* and perhaps https://en.wikipedia.org/wiki/Silesian_weavers%27_uprising

Obviously the comparisons aren't exact, but it's clear the show had a great many sources of inspiration (or maybe history rhymes as it always has).

Well... there is also https://en.wikipedia.org/wiki/Nobel_disease