Origami: Rhinoceros

Rhinoceros

Rhinoceros, designed by Nguyen Hung Cuong

When I folded this model back in 2016, I was challenging myself to fold it without explicit instructions.

Traditionally, people fold origami by following folding diagrams, which list out the steps in sequential order.  However, at more advanced levels, you can fold origami with nothing but a crease pattern, also called a CP.  A CP shows where all the essential creases will lie, if the paper were fully unfolded.  CPs provide information in a much more condensed format, and are far easier to create than folding diagrams, so it tends to be a lot easier to find CPs than full folding diagrams.

Below the fold I have a few tips for origamists interested in folding from CPs.

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Reading The Urth of the New Sun

I recently finished The Urth of the New Sun by Gene Wolfe, a coda to his most famous series, The Book of the New Sun (which I wrote about in two halves). This post will contain lots of spoilers, although I’m going to continue beating my drum about how it’s okay to see spoilers for this particular series.

To review: The Book of the New Sun took place in a far-flung post-apocalyptic future, where technology is advanced, but the general populace lacks access and education, so that it plays out like a medieval fantasy. The story followed Severian, former apprentice of the guild of torturers, who is destined for the throne of the Autarch. It is a coming of age story in which Severian comes to reckon with an upbringing that trained him to do something that he could not morally accept.

The Urth of the New Sun follows the events of The Book of the New Sun, but it is thematically completely distinct. It is no longer a coming of age story at all. Instead, it reads like Christian meta fiction.

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Link Roundup: October 10th, 2022

FYI, I was interviewed about romantic attraction and other things, for Honi Soit, a newspaper for the University of Sydney.  I like the article a lot, although I hope it’s not too dense, haha.

Summer of Math Exposition 2 | 3Blue1Brown (video and article series) – SoME2 is a contest to produce math explanation articles and videos.  I am all over this–although I’m also judgmental so I will say that the quality can be mixed.  The winners are a good place to start.

I’ve written quite a number of math explanations in the past myself, and this makes me want to write more.  Gosh it sure takes a lot of work though.  Maybe I could revamp my really old explanations, like the one about the Banach-Tarski paradox, or the ant & rubber band problem (the rubber band is the universe).

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Musical maturity and bad statistics

Among music-likers, it’s often said that your musical tastes are defined by what we enjoyed at age 14, or that our favorite music came out when we were 14. This claim comes from a 2018 article in the New York Times titled “The Songs That Bind” (paywalled). This article contains dubious statistical analysis, and its claims are probably false.

The article uses Spotify data, “on how frequently every song is listened to by men and women of each particular age.” There are two distinct ways of analyzing this data:

  1. The person level – Look at each individual, and see which songs they listen to most.
  2. The song level – Look at each song, and see which individuals listen to them the most.

So let’s read the article carefully and determine which analysis was used.
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Most approachable? A dialectical review of Elden Ring

Dark Souls and other games made by FromSoft are legendary for their fans’ elitism. The phrase, “git gud”, archetypically spoken to the souls newb who asks for advice on game forums, resonates throughout gaming discourse. “Souls-like” and “The Dark Souls of” are practically synonymous with video game difficulty, and the conversation around it.

But when FromSoft released Elden Ring this year, I loosely followed the fan subreddit, and found that elitism was not nearly as common as reputed. The phrase “git gud” was rarely used, and only then as a joke–and not a funny joke either, but the kind everyone else would groan at. Perhaps I’m looking at the wrong fan-sites, but my impression is that the fans have moved beyond elitism. They have come to recognize that, actually, it would be great if more people enjoyed this series, so that they could make more of it.

It’s possible that fans and critics and have overcorrected for past elitism, now declaring that Elden Ring is FromSoft’s “most approachable game yet.” Other critics have pushed back, highlighting how the game can still be unfriendly to newcomers. To explore this issue, I present two reviews from different perspectives.

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Closed square origami box

closed square origami box

Closed Square Origami Box, designer unknown

Some readers are interested in origami that they can actually make themselves.  The trouble with that is that many of the designs are quite complicated, or it’s difficult to get instructions that can be shared.  For original designs, it can take hours to draw diagrams even for relatively simple designs–and most of them are not very simple at all.  Other designs I get from books, and the diagrams are under copyright!  And for many designs, the only available instructions are the crease patterns.

Today I present a design that I happen to have diagrams for.  This closed square origami box is not my design, but I couldn’t find diagrams so I drew up some myself.  Someone also made a video.  Diagrams below the cut.

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Regulating data science with explanations

Data science has an increasing impact on our lives, and not always for the better. People speak of “Big Data”, and demand regulation, but they don’t really understand what that would look like. I work in one of the few areas where data science is regulated, so I want to discuss one particular regulation and its consequences.

So, it’s finally time for me to publicly admit… I work in the finance sector.

These regulations apply to many different financial trades, but for illustrative purposes, I’m going to talk about loans. The problem with taking out a loan is that you need to pay it back plus interest. The interest is needed to give lenders a return on their investment, and to offset the losses from other borrowers who don’t pay it off. Lenders can increase profit margins and/or lower interest rates if they can predict who won’t pay off their debt, and decline those people. Data science is used to help make those decline decisions.

The US imposes two major restrictions on the data science. First, there’s anti-discrimination laws (a subject I might discuss at a later time). Second, an explanation must be provided to people who are declined.

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