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.

Yes, it really works!

Klein not-a-bottle-opener is here.

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

Pendant with delicate design of blossom branch.
Specialy designed for silver.
Perfect as a special gift for your beloved one.

If you want Coloured version, head over here : Blossom Heart
Smaller version of the design : Silver Blossom heart Smaller