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David K Butler

@davidkbutler.bsky.social

Lecturer at Maths Learning Centre, Uni Adelaide (my views here). Grad Dip Ed & PhD Finite Geom. Love maths and helping people learn. he/him

1,785 Followers  |  666 Following  |  5,964 Posts  |  Joined: 10.10.2023  |  2.0114

Latest posts by davidkbutler.bsky.social on Bluesky

Wordle 1,638 4/6.

1: b Y b b b …
2: b Y Y b b …
3: G b b G G …
4: G G G G G …

Kind of proud to move that first yellow letter to the right using words that follow a theme. (The target did not follow the theme.)

12.12.2025 20:26 — 👍 0    🔁 0    💬 0    📌 0

A boy in the public toilets moves his hands around beneath the hand dryer's nozzle, trying to find a position that makes it start. Eventually he shrugs and moves his hands away, only to jump almost a foot in the air when the dryer suddenly starts with a loud noise.

12.12.2025 09:23 — 👍 2    🔁 1    💬 0    📌 0

A boy in the public toilets moves his hands around beneath the hand dryer's nozzle, trying to find a position that makes it start. Eventually he shrugs and moves his hands away, only to jump almost a foot in the air when the dryer suddenly starts with a loud noise.

12.12.2025 09:23 — 👍 2    🔁 1    💬 0    📌 0

An elderly woman pushes an elderly man through the shopping centre in a wheelchair. At least five bags from various shops hang from each of the wheelchair's handles.

12.12.2025 09:06 — 👍 1    🔁 1    💬 1    📌 0

An elderly woman pushes an elderly man through the shopping centre in a wheelchair. At least five bags from various shops hang from each of the wheelchair's handles.

12.12.2025 09:06 — 👍 1    🔁 1    💬 1    📌 0

A teenage boy on the train lies with his head tipped back and his mouth wide open to the ceiling. Loud reverberating snores echo through the carriage for the entire journey.

12.12.2025 09:00 — 👍 1    🔁 1    💬 1    📌 0

A teenage boy on the train lies with his head tipped back and his mouth wide open to the ceiling. Loud reverberating snores echo through the carriage for the entire journey.

12.12.2025 09:00 — 👍 1    🔁 1    💬 1    📌 0
Image of Shax from Star Trek Lower Decks with the words "Sufficiently advanced incompetence is indistinguishable from malice"

Image of Shax from Star Trek Lower Decks with the words "Sufficiently advanced incompetence is indistinguishable from malice"

We all know Clarke's "sufficiently advanced technology is indistinguishable from magic"

Well we have corollary:

12.12.2025 02:25 — 👍 9799    🔁 2218    💬 160    📌 112
Preview
Jenga Views This blog post is about a sequence of visual perception and geometry puzzles I have created called Jenga Views. You can download a file here with 39 puzzles, roughly in order of difficulty. In my p…

New blog post about the history of my collection of geometric visualisation puzzles Jenga Views. BONUS: I've added even more puzzles! cc @joeldavidhamkins.bsky.social davidkbutler.xyz/2025/12/11/j...

10.12.2025 21:56 — 👍 11    🔁 8    💬 1    📌 1

Look it’s tough living in such existential dread all the time.

12.12.2025 03:18 — 👍 4    🔁 0    💬 0    📌 0

I couldn’t figure out why I was so grumpy, but it’s because I am feeling like my needs are in danger of being erased in the name of consistency.

11.12.2025 20:37 — 👍 3    🔁 0    💬 0    📌 0

Wordle 1,637 4/6.

1: b Y b b b …
2: b b G G G …
3: b b G G G …
4: G G G G G …

I was kind of surprised I won on the third word with those last three letters, but checking the tool after the fact, there are not actually that many words that end in those three letters.

11.12.2025 14:45 — 👍 0    🔁 0    💬 1    📌 0
A sepia photo of a samurai saying, “You are trying to view Flash content, but you have no Flash plugin installed.”

A sepia photo of a samurai saying, “You are trying to view Flash content, but you have no Flash plugin installed.”

11.12.2025 05:54 — 👍 5    🔁 1    💬 0    📌 0

Ohhh. I think I understand something. I've waiting around for some decisions to be made because the management team wants to ensure everything in the wider team is "consistent". But consistency isn't always a good thing, such as when everyone gets the same stairs, even the wheelchair user.

11.12.2025 09:42 — 👍 3    🔁 0    💬 1    📌 0
10. How to be polite and show respect

In the old days of feudal Japan, a samurai warrior would shout

You are trying to view Flash content, but you have no Flash plugin installed.

10. How to be polite and show respect In the old days of feudal Japan, a samurai warrior would shout You are trying to view Flash content, but you have no Flash plugin installed.

03.12.2025 23:43 — 👍 21    🔁 10    💬 1    📌 0

I’m glad you like them!

11.12.2025 02:43 — 👍 0    🔁 0    💬 0    📌 0
jenga-views.pdf

Until my blog is working again for you, you can access Jenga Views direct here: drive.google.com/file/d/1rPl5...

11.12.2025 02:12 — 👍 1    🔁 0    💬 2    📌 0

Hmm. I'm sorry I don't know what's going on there. It's working at my end. :-(

11.12.2025 02:05 — 👍 0    🔁 0    💬 1    📌 0

Do you mean the link I shared in the skeet won’t load?

11.12.2025 02:03 — 👍 0    🔁 0    💬 1    📌 0

Oh no!

11.12.2025 02:01 — 👍 0    🔁 0    💬 1    📌 0

A small family sits on three sides of a square table in a restaurant window. The two parents are both reaching over with their knives and forks and simultaneously cutting up the food on their small child’s plate.

11.12.2025 01:35 — 👍 1    🔁 1    💬 1    📌 0

A small family sits on three sides of a square table in a restaurant window. The two parents are both reaching over with their knives and forks and simultaneously cutting up the food on their small child’s plate.

11.12.2025 01:35 — 👍 1    🔁 1    💬 1    📌 0

A woman stands on a suburban street corner, reaching up with her phone in her hand to get the best shot of the spectacular purple jacaranda blossoms on the low-hanging branch above her.

10.12.2025 21:14 — 👍 1    🔁 1    💬 1    📌 0

Hilariously I have also spelled “knew” wrong.

11.12.2025 01:25 — 👍 3    🔁 0    💬 0    📌 0

This is seriously cool.

10.12.2025 23:14 — 👍 7    🔁 4    💬 0    📌 0
Video thumbnail

Made a site comparing the sizes of living things :)

The great Julius Csotonyi spent 5 months painting over 60 illustrations for the site, no ai used

> neal.fun/size-of-life/

10.12.2025 16:03 — 👍 2146    🔁 741    💬 63    📌 71

What exciting times! I hope you cope with the excitement.

10.12.2025 22:50 — 👍 0    🔁 0    💬 1    📌 0
Preview
New adventures, big mosaic energy, tiles, vehicles, and books updates from the wide world of children's mathematics

New TMWYK newsletter this morning! It's been a while!

tmwyk.beehiiv.com/p/new-advent...

10.12.2025 14:29 — 👍 6    🔁 4    💬 2    📌 0

Wordle 1,636 4/6.

1: Y b b G b …
2: b b G G b …
3: G b b G G …
4: G G G G G …

Forgot to use one of the green letters from Guess 2 in Guess 3, because I was so excited about the word I thought of.

10.12.2025 22:44 — 👍 0    🔁 0    💬 1    📌 0

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