# You're reading: Posts Tagged: klein bottle

### Conjoined Möbius Hat pattern by Woolly Thoughts

Pat Ashforth has written in to say that she’s released a new free knitting pattern for a Klein bottle hat with a – wait for it - twist!

### The Mathematician’s Shirts

Patches ready to sew

The shirt symbolizes the formality of a male-dominated society and of conformance to society’s rules. Mathematics, too, is a realm of formality and rules populated largely by men. Yet in both shirts and mathematics there is room for creativity and individuality.

In The Mathematician’s Shirt project, artist Madeleine Shepherd and mathematician Julia Collins set about challenging these notions by turning a collection of formal shirts (donated by mathematicians!) into mathematical art. Inspired by the work of mathematicians in Edinburgh, the fabric of the shirts got twisted into 4-dimensional shapes, woven into knots and stitched into different geometries.

### Video: A Klein Slinky

This is an old video I made showing how to make a Slinky look like a Klein bottle. It’s the easiest way of making a Klein bottle that I know of!

### Klein: outside the bottle

If you’ve heard of Felix Klein, it’s probably due to the Klein bottle, that strange four-dimensional object that is the subject of a new video here on The Aperiodical starring Katie Steckles and Matt Parker. Who is Klein and, apart from the bottle, what did he do?

Klein’s Times obituary records that he would point out “with a smile” that his date of birth comprised three squares of primes. So then, I will refer to his birth as taking place on the $( 5^2 )^{\textrm{th}}$ day of the $(2^2 )^{\textrm{th}}$ month in the year $43^2$ in Prussia. You might like to notice that today is the $( 5^2)^{\textrm{th}}$ day of the $( 2^2 )^{\textrm{th}}$ month as well, so it is the 163rd anniversary of Klein’s birth.

### Top N Facts about the Klein Bottle

In honour of Felix Klein’s birthday, Matt Parker and Katie Steckles investigate the amazing surface which bears his name.