A theorem walks into a bar...
The Klein Bottle is a mathematical joke: a surface with only one side.
This one feels just right in your hand and opens bottles with ease and style.
Built to last in steel, it's the perfect touch for any math fan's kitchen.
This is a fun gadget that you can have you in house to show your friends how the sphere was printed inside the rail and you can never detach it!
http://www.shapeways.com/model/edit/605978/ [NEW] Buy the v2.0!:
http://www.shapeways.com/model/108596/rail-with-a-ball-inside-keychain.html Buy the Keychain version