Another projection of the 4-dimensional hypercube, this one close to vertex-centered. I love the shape of its hull: almost a rhombic dodecahedron, but skewed just enough to keep the central vertices from meeting.
The more usual projection is here, other polytopes are here.
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.
The other half of a sculpture. The two parts are connected by ten 3/16" spheres which you'll need to source. Ball bearings will work fine; I'd recommend gluing them to just one half so you can see the design both together, and with its interesting cross-section exposed.
If you'd like to see this in metal, I'd recommend here.
Here's a button to get both halves: +
Lastly, here's the unsplit version.