Christian Lawson-Perfect @christianp@mathstodon.xyz

Thinking Outside the Plane: https://www.metafilter.com/183649/Thinking-Outside-the-Plane

Interesting roundup of 3d solutions to 2d problems, starting with Tarski's plank problem: Can you cover a diameter-\(n\) disk with fewer than \(n\) unit-width strips?

Sadly, they missed the 3d proof of Desargues' theorem: https://en.wikipedia.org/wiki/Desargues%27s_theorem#Three-dimensional_proof

There's also a 2d-3d connection with Miquel's six-circle theorem but I think it goes the other way: https://11011110.github.io/blog/2006/03/22/miquels-six-circles.html

I hope your day is filled with powerful Labour MP thinks a fetish is a "worry" and boldly declares he has thousands of them, the biggest of which is probably "the horses" energy today.

https://www.chroniclelive.co.uk/news/north-east-news/north-mp-hot-under-collar-1465910

lots of people discussing cultural norms without defining their cultural vector space

Went out to Tynemouth on Saturday.

the American Mathematical Society just published a free ebook called Living Proof, a collection of mathematicians recounting their often turbulent paths to where they are now. i've read a few of the stories and i think this is an amazing read, not just for scholars of math, but for anyone who is doing something where they simply don't feel "smart enough" to succeed. success is often made up of struggle and failure; this can be difficult to remember in our current times.

link: https://www.ams.org/about-us/LivingProof.pdf

If you want a gentle way to explore programming and #3DPrinting in a block-style GUI, consider taking a look at https://www.blockscad3d.com/editor/

You do not need to create an account to try it out, but you will need to export files to your own computer without an account.

If you have heard of Scratch or Blockly, this overlay for OpenSCAD is like that.

here's an excellent picture to illustrate

these cars both appear black. but under sunlight one of them is actually red. they both appear black because the sodium vapour lamps that they're being illuminated emit light at a very narrow range of wavelengths, and it just so happens that the red pigment on the car absorbs those wavelengths. even though orange is traditionally considered a "combination of red and green", this kind of orange causes a red object to appear black. ain't that cool?