Geometry


20
Jan 13

Arguing with Matt Parker about Pi and Tau

Numberphile is a great youtube channel about maths. They invited me and Matt Parker on to fight about the circle constant. Here it is:

You can also follow Matt on twitter. And catch us both live in Festival Of The Spoken Nerd.


5
Aug 11

Make your socks last longer with a Euclidean rubber glove switch

Your left hand and right hand are mirror images of each other. There's no way you can position your left hand so that it looks like a right hand. It will only look like a right hand if you look at it in a mirror.

There are molecules like this in chemistry. Molecules that can't be positioned in such a way as to look exactly like their own mirror image. These are called chiral molecules. We talk about them having a handedness because they share this property with our hands. Continue reading →


15
Feb 10

Shapes of constant width – coins from around the world

In a previous post I talked about shapes of constant width. I didn't know of any other coins besides the UK 50p and 20p that had the property of being the same width all the way round without being circular.

Well I was recently given this coin instead of 20p:

Shapes of constant width   coins from around the world Continue reading →


15
Jan 10

How 3D cinema works

I recently saw Avatar in 3D and 'forgot' to hand my glasses back in at the end. I thought I knew how this technology worked so I was very surprised when I started doing some experiments.

I saw Avatar at a Vue cinema that recently had 3D installed and the way it works is quite different to the IMAX. Continue reading →


23
Sep 09

50p coins make great wheels

50p coins make great wheels

50p coins are too pointy to use as wheels. Or so I thought. Continue reading →


21
Sep 09

Magnetic balls: reloaded

A few more exciting shapes made from magnetic balls. Here's the original post. And here's the full coverage.

This is a dodecahedron - 12 faces and 20 vertices (the faces a dimpled, that's not part of a standard dodecahedron):

Magnetic balls: reloaded

Continue reading →


16
Sep 09

Magnetic balls: the beginning

I bought these magnetic balls off eBay and I've made loads of cool stuff with them.

Trouble is, after I've made one cool thing I have to destroy it before I can make another cool thing. So this blog will also serve as a photographic record of my achievements.

Let's get started then. These are the balls in an unordered state:

Magnetic balls: the beginning

And here they are as a Möbius Strip:

Magnetic balls: the beginning

Continue reading →