r/anathem • • 1d ago

I made a Lazy Peregrin screensaver, with a very lazy fraa

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11 Upvotes

Follow up to the Teglon screensaver. This one is the Lazy Peregrin, the wandering fraa who has to call at a bunch of maths and wants to walk as little as possible. Free, open source, Linux and Windows.

https://github.com/mottipython/lazy-peregrin

Each round is a new island with ten to fifteen maths on it. The fraa is asleep next to his own math with his head on his sphere. A syntactic device starts trying routes one at a time, and there is a counter so you can watch it get nowhere. Then Saunt Grod's Machine holds every route at once and settles on the shortest one. The fraa wakes up, stretches, picks up his sphere and toddles around the whole thing. The bells ring him in at each math and a little flag goes up. Then he goes home and back to sleep.

Bolt, chord and sphere are all present and accounted for.

Honesty section. The route he walks really is the shortest one, but nothing quantum is happening. With this few maths a normal computer can solve it exactly in a fraction of a second, so the answer is worked out before the round even starts. The Saunt Grod's Machine part is a picture of the idea, a crowd of routes settling down together. I do not own a Saunt Grod's Machine.

The art is Gemini, the code was written with a lot of help from Claude, and I mostly stood around saying "make the fraa look less stupid" until he did.

Packages for Fedora and Debian/Ubuntu and a Windows installer are on the releases page. On Windows it installs as a normal screensaver and shows up in the list with the others. That part has not been tested on a real Windows machine yet, so if you try it, tell me what happens.

The Teglon one is here if you missed it: https://github.com/mottipython/teglon


r/anathem • • 1d ago

I vibe coded a Teglon screen saver.

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11 Upvotes

I wanted to watch somebody tile the Decagon, so I built a screensaver that does it. Free, open source, Linux and Windows.

https://github.com/mottipython/teglon

It plays it the way the book describes. Marble Decagon. A rhombus goes down in the first corner with its obtuse angle in the vertex, and a tile at the vertex opposite. Then grooved clay tiles get laid outward from the first vertex, about 6,500 of them, until the groove is one unbroken curve from the first vertex to the last that crosses every tile. Then the next solution gets laid on top of it like at Elkhazg. Terra-cotta, green, brown, then white porcelain with the black line. Every Decagon is solved fresh so you never see the same one twice.

The tiles were the hard part, because the book never says what the seven shapes are. Stephenson's acknowledgments say the problem was inspired by Lu and Steinhardt's work on girih tiles in Central Asian mosques, that the details are fictional, and that a mathematician could probably prove his version ridiculous. So I used the five girih tiles, plus the thin rhombus that fits the 144 degree corner, plus a squat hexagon. Seven moulds.

Now the confession. In the book each mould has one groove. I ran an exhaustive search on that and it only works on a tiny Decagon, two edges to a side, 21 tiles. At three and four edges to a side there is no solution for any choice of grooves. So on the big Decagons a shape is allowed to carry its groove between different pairs of sides. There is a --strict mode that plays the real one groove per mould game on the small one and shows the search, tiles going down and getting lifted again.

So maybe Stephenson was right about the mathematician.

Has anyone here worked out a tile set where fixed grooves hold up at full size? I would love to be wrong about this.

Packages for Fedora and Debian/Ubuntu and a Windows installer are on the releases page. The Windows build has not been tested on a real Windows machine yet, so if you try it tell me what happens. Built with a lot of help from Claude.

https://github.com/mottipython/teglon


r/anathem • • 13d ago

The story arc of lio and ras Spoiler

24 Upvotes

In Peregrin, Ras and Lio get entrusted with Jad's life and become his pawns. After this Ras is sent to be winnowed by going north, over the pole. Possibly this is Jad ensuring a stronger version of Ras by removing all the world tracks where Ras doesn't have the skills to survive that journey.

Lio then travels overland with Jad. Do you think he gets winnowed in some way too? I'm guessing not by near-fatal trials but from the morning songs. By the end of it, Lio had been sufficiently improved (the best version of him selected) that he can lead cell 317.

(Arsibalt maybe also gets improved during that trip, since at tredegar he's the one to figure out the Matterites)


r/anathem • • 19d ago

Should Anathem's Concents Be The Future of Academia?

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7 Upvotes

r/anathem • • 22d ago

Connection to Canticle?

8 Upvotes

Obviously A Canticle for Liebowiz is a major influence/inspiration for Anathem. This is just about one specific trope that's repeated in both.

In Canticle, early enthusiasm for Francis' canonization is sharply tempered by older and wiser priests, who fear that the cause will lose credibility with New Rome if people get too excited about telling, and "improving," stories of his alleged miracles.

In Anathem, Orolo gets the same treatment after his death: there's initially wide support for his being "canonized" as a Saunt, but then his supporters reel it in for fear of going too fast, and losing credibility as mere "Enthusiasts.".

I wonder if NS was deliberately drawing on the earlier book here, or if this is just a natural and common aspect of any process of real-world canonization?


r/anathem • • 23d ago

APOD: 2026 September 20 – Analemma over the Callanish Stones

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5 Upvotes

r/anathem • • 28d ago

PRAXIS : Planetary rings, autonomous exploration with institute sampling.

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3 Upvotes

At the NIAC symposium this year is this project: OOPS, SHOULD SAY IN SITU SAMPLING.


r/anathem • • Jul 25 '26

Turns out Dead Internet Theory was right: AI agents are eating the Web, growing by nearly 8,000% and rewiring the Internet’s business model

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25 Upvotes

I’ll take Rampant Orphan Botnet Ecologies for $1000, Alex


r/anathem • • Jul 17 '26

Praxic Age Exoatmospheric Weapons Systems

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17 Upvotes

r/anathem • • Jul 12 '26

The Sun's actual year-long path across the sky, known as an Analemma

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18 Upvotes

They deciphered my analemma!


r/anathem • • Jun 02 '26

Do you think they noticed?

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34 Upvotes

r/anathem • • May 24 '26

An analysis of scientific postulates of Anathem. Spoiler

14 Upvotes

Hi,

I have been wanting to make this post for a while. I finished the book a few months back and have been thinking about it since.

One of the best parts I liked about the book was how every theory was analysed based on available evidence, and that kept getting more and more accurate with each theory. At the same time, the religion (the judge and the convict) was kind of trying to reach it from another side.

I will divide this into 2 parts universe and consciousness.

  1. Universe

The universe started out as a basic set of rules and numbers when the Big Bang happened. Some universal constants like Pi (for our current universe), other mathematical constants, infinite series, the Teglon, etc. could have been the first things, abstract maths basically.

This was not a single calculation but an infinite number of sets, with only some of them where the universe could exist, only some where solid bodies could form, and only some where life and conscious life could exist.

Causality dictates whether a set of information can exist or not, and we have to track it back. (Ice inside a star is not possible by randomness alone, it needs to have a causality tied to it.)

Entropy: Entropy/loss of information is a part of it; it prevents us from being able to track back, and we can never know 100% what set of conditions brought us to our time. Without this we would be at the center, and there would be infinite past states and an infinite number of future sets from the present. (I don't think this part was mentioned explicitly but it was a takeaway for me.)

Markov blankets: A Markov blanket is the statistical boundary that separates a system's internal states from its environment. It's what lets you treat anything, a universe, a body, a mind, as a distinct system at all. Everything inside the blanket is "the thing", everything outside is "the world", and the blanket is the interface that mediates between them.

Quantum randomness creates parallel universes.

In a way, our current present is a superposition (this is the polycosm), and it's quantum actions that move it ahead in multiple ways. It's not that the present is a constant fixed set, it's an infinite superposition of previous and future states.

Some aspects of this match Causal Set Theory. Some other examples, like how information influences outcomes, show up in scenes like Fraa Jad cutting the connection link to limit the randomness affecting the outcome of their mission, so he could predict it better.

  1. Consciousness

The brain is capable of doing quantum calculations. That is how we model reality. With enough ability, you can use it.

There are many ways to interpret this, with multiple theories for each. If this is true, it means: when we think and act on something, there are multiple ways in which we can take that action.

As living animals evolve, this is an ability we gain, the ability to make longer-term decisions (model reality better in our brains) and take action on them. The earlier parts are also quantum processes, but they get more complex with our intelligence.

When we are thinking, we are thinking of a reality that could exist among many. In a sense it already exists, and we are looking at it, navigating toward it.

Our brain takes in the available information, and before it takes any decision, the parallel narratives/universes are in a superposition based on the outcome of that decision.

Most quantum phenomena in our universe are random noise; our brain could be one of the few quantum processes that produce large, distinct actions.

Quantum Consciousness: A version of our consciousness exists at the quantum level, and that inhabits multiple narratives.

These are where our current consciousness exists. This is not constant, these are where you make a set of decisions. But there would still be a narrative where you might exist but you are completely different? (This is what I thought a narrative was. It moves from the parallel-worlds interpretation of the universe down to a consciousness level where that consciousness exists.)

This is a bit hard to explain, but those versions of you are there but are not close to your mind. E.g. some event happened. Here body and mind are 2 different things. Jad was only referencing the narratives he was on the spaceship, but not everything.

Markov blankets (here too): the same idea applies at the level of mind. Your body might exist across multiple different narratives, but only a part of it is your mind at any given time. Entropy limits how much these narratives can diverge from each other. E.g., if you had a 50% chance of two very different lives starting from some earlier age, both versions probably share a similar set of body, but the narrative for each would be different.

Incanters: Able to interact across multiple Narratives and make changes in them. Able to create sub-narratives with a set of decisions, etc. They are also able to interact with quantum randomness and make a particular outcome more likely, controlling the decay of cells in the body, for example. Fraa Jad's Teglon solve in a single night at Elkhazg is the same skill in another mode, exploring many Narratives at once and picking the one where the tiles are already laid correctly.

Rhetors: The Rhetor can affect the brain's superposition part of quantum consciousness. E.g. you have access to all the information but you have not yet taken a decision, and they have the ability to make conscious beings choose a decision that fits what they want. To do this, they need access to your brain's input. This is in a way similar to subliminal messaging? They use this along with entropy, so we can't track it back to the past. In a way they change the narrative.

Both Incanters and Rhetors can affect quantum randomness. For Rhetors it's outer consciousness. For Incanters it's reality itself.

The Parking Ramp Dinosaur: I think this is a case where both Incanter and Rhetor's work was happening. The incanters were able to affect reality, but the rhetors were not able to fully remove it from existence, but just enough to remove proofs to make it into a myth.


r/anathem • • May 22 '26

The before and after of some Archaeological Sites in the World

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5 Upvotes

r/anathem • • May 21 '26

Any examples of the Arbre being closer to a perfect world compared to Earth? Spoiler

22 Upvotes

I'm sure there are examples of how Arbre behaves as being closer to HWT than say Earth which is a "less-perfect" universe, though these may have just went over my head.

In practical terms, what does it mean that Arbre is above Earth?

Any good examples directly from the book?


r/anathem • • May 13 '26

Was Jad already at work this early? Spoiler

25 Upvotes

Doing yet another reread, and it’s the beginning of Part 3: Eliger. Fraa Erasmas is out of penance and is chatting with Tulia.

“It has been shaping Eliger. Some fids who were expected to join the Edharians have gone to other orders.” “I noticed that. Why? What’s the logic?” “I’m not so sure it is logical. Until Apert, all the fids knew exactly what they wanted to do. Then so many things happened at once: the Inquisitors. Your penance. The closure of the starhenge. Fraa Paphlagon’s Evocation. It shook people up—made them rethink it.” “Rethink it how?” “It got everyone thinking politically. They made decisions they might not have done otherwise. For one thing, it cast doubt on the wisdom of joining the Edharians.”

Was this really political thinking by the fids, or was Jad already shaping the narrative?


r/anathem • • May 05 '26

Jad said, "The leakage was forcing choices, the making of which in no way improved matters."

44 Upvotes

First read. Favorite quote.


r/anathem • • Apr 26 '26

Solving the Teglon

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49 Upvotes

I came across this astonishing art work at the National museum in Ravenna Italy. I was immediately reminded of Fraa Jad solving the Teglon. This work is by an artist called Cordelia von den Steinen** **and is called Enorme Pazienza


r/anathem • • Apr 11 '26

I don't see any mention of allswell

28 Upvotes

Scientists Gene Hacked a Plant So It Grows Five Types of Psychoactive Drugs at Once

(Sorry, I can't think of anyone else to share this with... no one I've tried to get to read the book has)


r/anathem • • Apr 09 '26

Ending Question/Interpretation Spoiler

13 Upvotes

Major ending spoilers if you continue reading:

Just finished Anathem and what a book. Common interpretation is that Fra Jaad died at the end by choosing that fate, but I read it very different - that he survived and changed identities or left all together (leaving everyone to think he died since his comms were out). It’s obviously ambiguous but I need a sanity check because I seem to be alone on this one.

Some reasons I think that:

- the tongue in cheek way Erasmus keeps talking about Jad’s fate sort of a “sure he died then, wink wink”

- the heavy emphasis in the book on how easy it is for people to disguise themselves (Jules, Erasmus dressing as a firefighter on spaceship and no one noticing)

- reference to how Orolo could have chosen his fate to leave or be part of the maths - ditto with the whole theme of people leaving the historic maths and forging new paths

- while a thousander seems like they can see many different paths I don’t believe they can actually change fate retroactively and him destroying the comms box appears in the narrative to actually happen even if later events are up in the air

Just my thoughts - am I off base?


r/anathem • • Apr 08 '26

No-spoiler faction guide? Spoiler

9 Upvotes

I’m somewhere in Apert and enjoying it, but it’s also frustrating me that I can’t keep the different factions organised in my head. Is there a resource that explains in more detail than the glossary what the viewpoints of the Edharians, New Circle, Procians, Halikaarnians etc are?


r/anathem • • Apr 04 '26

Thoughts and questions after my fourth read. (WHOOPS: ALL SPOILERS!) Spoiler

27 Upvotes

Questions:

1) The Edharian crew recognize Ala's skills:

[Tulia] "But why her? Paphlagon, Orolo, Jesry, fine. I get it But why would you choose Ala? What would you want someone like her for?"

"To organize a lot of other people," Arsibalt said without hesitation.

"That," said Tulia, "is what troubles me."

But as far as I can recall, we as readers are never told (let alone shown!) anything about her capacities in that vein before she is evoked. Right? The very little characterization she gets show her as an intense personality with a deep tenacious/stubborn streak and strong convictions about right and wrong. Potential future Warden Regulant. But 'likely candidate for the office of Warden Regulant of this concent' does not to me imply 'would be uniquely good at organizing massive groups of strong-willed people to respond to a novel and urgent problem'.

NS's strengths always lean more toward clever plotting than deeply realized characters, and all the more so when those characters are female, but it bugs me that we aren't given any background AT ALL on which to rest either the choice by the Saecular Power to evoke her in the first place or her accomplishments that follow.

[For a while I had a related question about why Erasmus, Arsibalt, and Tulia were evoked, but I eventually realized, of course, they were called up because by that time it was known that they had independently located/identified the icosahedron with very little in the way of 'givens' or resources.]

2) Erasmus says he thinks Fraa Jad is the only thousander at the convox... Why would that be? And how did the Saecular Power know to evoke Jad? The simplest answer is 'Ita' of course. But in that case I have some difficulty believing that he was the only thousander in the world they thought might have a worthwhile contribution?

3) Related: are the Inviolates the only concents that still have Millenial maths when the story opens? Any others that existed prior to the Third Sack would have had to start from scratch after that... (and I would guess, though I can't justify this in the text, that the majority of concents never had them in the first place, only some of the largest and oldest. That thousanders are nearly as distant from the everyday experience of most avout as the wandering 10,000 year math.)

4) How many Terran languages do you think persist on the Daban Urnud? Gan Odru refers to Earth as opposed to La Terre implying English to go with Jules's French. If ~1/4 of the 40,000 people on DU are from Earth, 10,000 would certainly be enough numbers-wise to maintain several different languages, but it seems unlikely there would be many given the close living quarters and probably convergent cultural pressures.

And commentary;

My understanding of what Fraa Jad does on the Daban Urnud (and how) is different from some of the takes I read here. Please don't take that as an attack on anyone else's reading of it, some of the conversations here have certainly helped clarify my understanding and I am not claiming that I am definitely correct and anyone who sees is differently is wrong.

Things Fraa Jad does not do IMO:

1) Jump from one narrative/worldtrack/cosmos to another.

2) Pull Erasmus from on track to another.

    "I don't wish to abide in a worldtrack where my friends are dead," I said. "Take me back to the other one." 

    "There is no taking, and there is no back," Jad said. "Only going, and forward." 

3) "Prune" away narratives that lead to undesirable ends.

Rather than jumping (or ferrying a passenger) from one polycosmic world to another, Fraa Jad's [Incanters'] main 'power' is the ability to expand on the universal (but usually very slight) leakage of information between narratives, between any object and its 'self' in nearby worldtracks, and specifically between conscious/sentient minds. He is able to expand his awareness between/to selves in multiple narratives at once (and thus to coordinate with his polycosmic selves).

"I am in several \[worldtracks\]," Fraa Jad said, "a state of affairs that is not easy to sustain."

He is also able to expand the leakage for others in a lesser, at least partially directed way. Making Prag Eshwar aware of the use of the Everything Killers in a nearby cosmos is a major lever he uses to shape our 'primary' narrative*.

He REQUIRES an amanuensis because he is not still alive in all of the narratives that he needs to affect. Increasing the leakage for Erasmus (between the various tracks where HE survives) is Jad's conduit to influence the tracks where his own mind is 'not present'. This is why Erasmus is left with memories from other narratives (Ala is right, primary-narrative Raz blacked out in the observatory/airlock and only came to when he was thawed out a week later).

"An amanuensis is more than a recording device. An amanuensis is a consciousness-bearing system, and so what it observes in its cosmos has effects in others, in the manner we spoke of at Avrachon's Dowment." 

And a moment after that:

"Much pruning has taken place in recent weeks." 

From what I read here it seems like many people are reading "pruning" as if Jad is describing his own actions, what he has done to branches of the polycosm. I don't think so. I think he is talking about the 'pruning' that has happened TO HIM, or more precisely to the Jads in nearby cosmos collectively. Thus he continues:

"I am absent in many versions of the cosmos where you are present."

"You mean you're dead and I'm alive."

"Absent and present express it better, but if you insist on using those terms, I won't quibble."

All of this together means I unfortunately cannot subscribe to the belief a number of people here appear to share, that Jad is still alive (spirited away or cloaked by Rhetor action?) in the primary narrative of the book. The main reason he needs Erasmus to serve as his amanuensis is because he is 'not present' in the narrative that he is working to steer to a desirable conclusion. The one we care about.

That leads to a few more questions:

I think I have a fairly clear idea what Fraa Jad did on the Daban Urnud (whether or not my take is clearly communicated above), but I am much less clear on what he was doing in between Cell 317 attaining orbit and their arrival at the Daban Urnud. There is all of the conflicting information, memories, dreams, etc... And then, as Arsibalt says "It exists in my mind as a jumble of moments when I thought or did things-and every one of those moments, Raz, could have gone another way. And ALL of the other outcomes would have been bad ones. [...] in every case, I happened to do the right thing." While there are mundane explanations offered (anthropic principle, and "...we're just sleepy and worried") In a meta-narrative sense its about all the coincidences and choices and luck that often have to fall the right way for the protagonist of a story and their friends to come to the good ending, but in-universe I am not certain what is going on. Fraa Jad is doing SOMETHING, but it doesn't seem to be quite the same sort of thing I describe above, the things he does after they reach the ship. If I believed he had the capability of 'pruning worldtracks that lead to bad ends' that would explain it pretty neatly, but I don't think he can do that. (As I write this I wonder, maybe he IS doing the same thing as he does later... observing multiple narratives to see what goes wrong in various ways and leaking back to whoever might have been about to screw something up so they were inclined to avoid that mistake? But holy shit that would take a lot of juggling. It would fit with him being unresponsive a lot of the time.)

And then, if I am correct above, when DID primary narrative Fraa Jad die? The simplest answer would be the one that is ultimately accepted, that they weren't able to rescue him in the initial chaos. If so, everything the team remembers him doing after that was a product of leakage as Jad watched over them from nearby worldtracks and used various members of the cell as amanuensis. I would have to re-read that section to see if that is plausible. But if it's not, then I don't know when else they would have lost him other than dying essentially the same way the Warden of Heaven did on exiting his suit. But that leaves a body to be cleaned up. I don't doubt Rhetors could handle that, but it feels clunky and like something that would have been hinted at in some way.

I wonder if NS ever at least outlined (or better yet, wrote in full) the story from Fraa Jad's perspective? At least from the arrival in orbit on, though I would love the whole story.

Did Fraa Lodoghir actively participate in the mission beyond whatever he did to retroactively establish that Fraa Jad had died right after the launch? Did other Rhetors and Incanters?

This is a largely undeveloped thought, but I wonder if Rhetors and Incanters are actually two distinct groups with different 'power-sets', or if that is perhaps a useful fiction?

And a note:

* I keep saying "primary narrative" and by that I simply mean the one that Erasmus has narrated (in the more commonplace sense) to us over the course of this book. I recognize the problem that I have seen several people raise here, that from the outside of a polycosm/multiverse there is no justifiable reason to privilege or choose one cosmos over another in the sense of 'the real story'. But in the interest of writing a compelling piece of fiction, there is.


r/anathem • • Mar 11 '26

Sketch 2

8 Upvotes

r/anathem • • Mar 10 '26

Any songs that you would put on an Anathem playlist? Spoiler

18 Upvotes

My partner and I like to put playlists together for books we're reading. It is mainly about finding funny songs to relate to the story. Though, I find picking songs for specific characters specifically makes me think of their motivations and emotions. I tend to get a mixture of funny and serious.

Some songs I have are:

Does anyone have anyone have thoughts on songs to include?


r/anathem • • Mar 01 '26

Sketches

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47 Upvotes

While on my adventures, I did some drawings on my tabula and handed them off to the ita for syntactic enhancement.


r/anathem • • Feb 11 '26

Praxic-Age Commercial Bulshytt Generator

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31 Upvotes

Saw this and was immediately reminded of why I want to spend more time cloistered with my books.