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It feels like a lot has happened since I finished making the two-sided ruler constructions videos and blog posts. I'm still so proud of what I did.

#read2026 Unseen Academicals, by Terry Pratchett This story focuses mainly on four people who work behind the scenes at Unseen University, particularly Mister Nutt who is very strange in multiple directions. Also there is football.

Pattern block and joined mirror designs made by the university students at the O’Week One Hundred Factorial sessions this week.

Save us from retired sports stars with nothing to do anymore.

Found the Asteroid Creatures again today. I love them so much.

Why isn't paste as plain text the default?!

One of the main issues with mental arithmetic is having to hold too many things in your mind at once. The very act of typing my thoughts meant I had a record of my thoughts in front of me. I'm not sure I would have pulled it off without writing anything at all as I went.

It's always nice to see people enjoying things.

A quick little blog post with some thoughts about what sometimes happens when you tell people to do a task a specific way: davidkbutler.xyz/2026/07/26/i...

I did it my wayIt’s Second Semester Orientation at Adelaide University right now, and last week I helped out at a session called Starting Strong for new students. One part of that session got the students t…davidkbutler.xyz

There are no exceptions to this rule. Even if you really hated maths at school, you don’t get to tell me that when you see me doing maths for fun.