Drag the sliders to rotate the cube and see how its shadow changes.
Continue reading Cube shadowsWhat’s Going On with my Knees?
A poem that’s mostly about nerves, and a little bit about lowest common multiples.
Continue reading What’s Going On with my Knees?
Rupert Polyhedra: Octahedron
A polyhedron is Rupert if you can cut a hole in it that’s large enough for an identical polyhedron to fit through. I’ve already talked about the Rupert tetrahedron and the Rupert cube. Now it’s the turn of the octahedron.
Continue reading Rupert Polyhedra: Octahedron
Rupert Polyhedra: Cube
Last week, I wrote about Rupert polyhedra, and how a tetrahedron has the Rupert property. The idea dates back to the 1600s, when Prince Rupert of the Rhine won a bet that it was possible to make a hole in a cube that was large enough for an identical cube to pass through, so let’s look at how the Rupert property works for a cube.
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Rupert Polyhedra: Tetrahedron
For a polyhedron to be classed as Rupert, it must be possible to cut a hole in it that is large enough for an identical polyhedron to pass through. It sounds impossible, but many polyhedra have this property, including the tetrahedron.
Continue reading Rupert Polyhedra: TetrahedronThe Multiples of Me
Continue reading The Multiples of MeI’m a prime
You know what that means
I have no factors
Okay, there’s one, and me
But they’re not proper factors
Real factors
Tangible factors
They don’t count, you see
I Like Brussels Sprouts
At the choir I sing with, we sang a Christmas-themed warm-up song to the tune of Jelly on a Plate. It’s a simple song with just one repeated sentence: ‘I like Brussels sprouts’. The catch is that you don’t break the sentence, even when it doesn’t fit with the phrasing of the song. The syllable counts for each verse are 5, 5, 4, 4, 5, so the first verse goes
Continue reading I Like Brussels SproutsI like Brussels sprouts
I like Brussels sprouts
I like Brussels
sprouts I like Bruss
els sprouts I like Bruss
(Not) Squaring the Circle: Explained – Part 2
For MathsJam 2019 I wrote a poem, (Not) Squaring the Circle, which features the construction of squares with the same area as given polygons. To make the poem work I had to omit some of the details of the constructions, and a few people have asked for more information about how they work. There is an explanation of the first part of the poem here. This post explains the second part of the poem, including how to construct squares with the same area as given triangles, pentagons and other polygons.
Continue reading (Not) Squaring the Circle: Explained – Part 2
(Not) Squaring the Circle: Explained – Part 1
For MathsJam 2019 I wrote a poem, (Not) Squaring the Circle, which features the construction of squares with the same area as given polygons. To make the poem work I had to omit some of the details of the constructions, and a few people have asked for more information about how they work. So here is an explanation of the first part of the poem, including some background on the problem and details of how to construct a square with the same area as a given rectangle.
Continue reading (Not) Squaring the Circle: Explained – Part 1Fold-and-Cut Christmas Tree
This time last year, The Aperiodical featured the fold-and-cut Christmas tree I designed in their Aperiodvent calendar. I designed it to use as a Christmas card. Print out the PDF, write a message on the tree, or decorate it if you like, then fold it following the dashed lines. When the recipient cuts along the solid black line, they will open out a beautiful Christmas tree.
Continue reading Fold-and-Cut Christmas Tree