Geometrick T-shirts

I had a T-shirt with a certain pattern that was fading out. I didn’t know at the time that this had a name, and later learned it was a geometrical pattern that had certain interesting connections. I won’t link to that here, but you can find it by searching for “Metatron’s cube” online.

Re-creating this geometrical pattern became a fun exercise within Wolfram Mathematica (which is such a useful and under-rated tool, btw, I can’t recommend it enough for anyone with the slightest interest in doodling, tinkering, learning, simulating …).

Nothing fancy, just a bunch of circles, points, lines, triangles. Good old-fashioned geometry.

I was able to experiment with a few different designs until I settled on one I liked. Mathematica allowed me to export what I had as a regular PNG file.

I still had to do some post-processing — to be honest, I’m sure there are tools within Mathematica for this, but I just used a photo-editing tool on my laptop to remove all the black and make the background transparent.

I had to pick a website to use for this, since there are so many options today. I went with something that I knew from many years ago, Zazzle, though again, I’m sure there’s something better right now.

Here is the finished product:

Here’s an example of rendering it within Wolfram Mathematica:

“Metatron’s Cube”

Polar Primes

This “five minutes of Wolfram Language” exercise can be surprisingly therapeutic 🙂

I had come across something interesting today:

However, I then wanted to try it out on my own.

These days, the commonly available frameworks/libraries make it too hard to just up-and-sketch-something.

… which is where WolframLanguage comes in.

I was able to make a simple notebook for this in five minutes:

Using WolframLanguage to see the spiral pattern in which primes show up when plotted in polar cp-ordinates

… and have the satisfaction of seeing that yes, it is indeed true.

Seeing things on your own, making things on your own, is a really nice feeling.

Wolfram Language “dashboards”

Playing around with Mathematica for a few minutes.

Or rather, using it to play around.

I’m trying to figure out the “least B.S.” portions of “web3/defi/whatever”. So far, a limited goal is to follow along a couple of “stable, publicly used and usable” blockchains, and I picked Tezos and Cardano for this.

I built some probing views for each, as cloud notebooks:

Transactions within the last 20 Tezos blocks as of around 5:09pm on Mar 13, 2022
Transactions within the last 20 Cardano blocks as of around 5:09pm on Mar 13, 2022

Very elementary stuff, but it took a few minutes, and really shows how Wolfram (Mathematica) is a really great “computational explorer” right now.

P.S. eyeballing the two, at a very subjective, no-flame-war, just-this-instance level, Tezos seems to be stably handling about 2x transaction throughput compared to Cardano.

On metric time


About a decade ago, I thought briefly, about how the day would feel, if we had some sort of metric units instead of hours & minutes, then forgot about it.

About six years ago, I had an Android phone, and wondered what it would take, to make an app for this. At the time, I looked into OpenGL support, and had some basic screen working, but the state of app development seemed like really grungy to me, and I forgot about it again.

About a year ago, I had an iPhone, and wondered what it would take to make an app for this. I had still never made a mobile app, but SwiftUI had recently been released, and … the state of app development seemed way less grungy, and SwiftUI did live up (mostly) to its promise of being a (mostly) declarative framework … so I made a prototype (using centi-days and milli-centi-days), and then forgot about it again.

Last month, I finally pushed it “over the line”. I had to fill out some forms, make some placeholder icons, and come up with a name.

I’ve always thought of the metric system being based on “tens”, and “ten” feels very “human”, so I called it HumanTime. (I don’t have the necessary free time these days, but it would be good to eventually round this off with a Watch app too).

Anyway, there’s no moral to this story, other than “I built a (small) thing” , “it’s good to make things“, and “I wish I’d done this earlier”.

If you want to take a look, it’s on the App Store: here.



I started on the first one when I had to stay at home for a few months when I broke my leg, and when that was done, I felt … “hey, I should do this again!”

Then I got another one but I realized I didn’t really have enough free time, which led me to carve out thirty minutes once every two weeks,to spend on this.

Also this second time, I decide to take frequent snapshots of what I was doing, and … I have this amateurish video I made on my phone:

(it’s just a Dropbox link; presumably there’s a smarter way to go about these things).

When I was done with the second one I looked back and found I had roughly done two of these in two years, at a very slow and steady pace … this should be turned into an “annual event” of sorts.

So, I have a third puzzle I’ve started on now (and incidentally, discovered that Ravensburger has quite the collection too; the first two were from Eurographics), which means I should be writing about it about this time next year 🤞.


I can’t believe I never discovered this before. I am never going to pay for quirky T-shirts or coffee mugs again, I’m just going to make my own! allows you to upload an image and slap it on to pretty much anything. I made a black T-shirt for myself a few days ago; it arrived today and fitted me well, (now just have to see how it performs after a round of laundry …).

For future reference, this is where I’m going to be adding stuff I make: