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The Colors Of Her Coat

Astral Codex Ten Podcast

Release Date: 04/14/2025

Links For April 2026 show art Links For April 2026

Astral Codex Ten Podcast

[I haven’t independently verified each link. On average, commenters will end up spotting evidence that around two or three of the links in each links post are wrong or misleading. I correct these as I see them, and will highlight important corrections later, but I can’t guarantee I will have caught them all by the time you read this.]

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Astral Codex Ten Podcast

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Astral Codex Ten Podcast

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Astral Codex Ten Podcast

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Astral Codex Ten Podcast

In 1917, some Portuguese children started seeing visions of the Virgin Mary. The Virgin told them she would enact a great miracle on a certain day in October, and a crowd of 100,000 gathered to witness the event. According to eyewitness reports, newspaper articles, etc, they saw the sun spin around, change colors, and do various other miraculous things. At least a hundred separate testimonies of the event have come down to us, with only two or three people saying they didn’t see it. Catholics continue to bring this up as one of the best-attested miracles and strongest empirical proofs of the...

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Astral Codex Ten Podcast

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Astral Codex Ten Podcast

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Astral Codex Ten Podcast

I. John Rawls was born in Baltimore, Maryland, on February 21, 1921. Not John Rawls the famous liberal philosopher (or, rather, John Rawls the famous liberal philosopher was also born in Baltimore, Maryland on February 21, 1921, but he is not the subject of our story). This is John Rawls the alcoholic. John Rawls the alcoholic was twelve when they lifted Prohibition. He partook immediately, and dropped out of school the following year, supporting himself through a combination of odd jobs, petty crime, and handouts. When he was 41, he committed a not-so-petty crime - killing a man in a bar...

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Astral Codex Ten Podcast

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Astral Codex Ten Podcast

  I hate the term “hallucinations” for when AIs say false things. It’s perfectly calculated to mislead the reader - to make them think AIs are crazy, or maybe just have incomprehensible failure modes. AIs say false things for the same reason you do. At least, I did. In school, I would take multiple choice tests. When I didn’t know the answer to a question, I would guess. Schoolchild urban legend said that “C” was the best bet, so I would fill in bubble C. It was fine. Probably got a couple extra points that way, maybe raised my GPA by 0.1 over the counterfactual. Some kids...

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More Episodes

In Ballad of the White Horse, G.K. Chesterton describes the Virgin Mary:

Her face was like an open word
When brave men speak and choose,
The very colours of her coat
Were better than good news.

Why the colors of her coat?

The medievals took their dyes very seriously. This was before modern chemistry, so you had to try hard if you wanted good colors. Try hard they did; they famously used literal gold, hammered into ultrathin sheets, to make golden highlights.

Blue was another tough one. You could do mediocre, half-faded blues with azurite. But if you wanted perfect blue, the color of the heavens on a clear evening, you needed ultramarine.

Here is the process for getting ultramarine. First, go to Afghanistan. Keep in mind, you start in England or France or wherever. Afghanistan is four thousand miles away. Your path takes you through tall mountains, burning deserts, and several dozen Muslim countries that are still pissed about the whole Crusades thing. Still alive? After you arrive, climb 7,000 feet in the mountains of Kuran Wa Munjan until you reach the mines of Sar-i-Sang. There, in a freezing desert, the wretched of the earth work themselves to an early grave breaking apart the rocks of Badakhshan to produce a few hundred kilograms per year of blue stone - the only lapis lazuli production in the known world.

Buy the stone and retrace your path through the burning deserts and vengeful Muslims until you’re back in England or France or wherever. Still alive? That was the easy part. Now you need to go through a chemical extraction process that makes the Philosopher's Stone look like freshman chem lab. "The lengthy process of pulverization, sifting, and washing to produce ultramarine makes the natural pigment … roughly ten times more expensive than the stone it came from."

Finally you have ultramarine! How much? I can’t find good numbers, but Claude estimates that the ultramarine production of all of medieval Europe was around the order of 30 kg per year - not enough to paint a medium-sized wall. Ultramarine had to be saved for ultra-high-value applications.

In practice, the medievals converged on a single use case - painting the Virgin Mary’s coat.

https://www.astralcodexten.com/p/the-colors-of-her-coat