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What is the central problem of beer? That it is contained in a bottle, which is to say a boundaryless compact 2-manifold homeomorphic to the sphere. Since beer bottles are not (usually) pathological or "wild" spheres, but rather smooth manifolds, they separate all of 3-space into two unconnected regions, viz. the region inside the bottle, containing beer, and the region outside the bottle, containing you.
What is to be done? Clearly, the elegant solution is to introduce a non-orientable manifold without distinct sides; indeed with only a single side. The Klein bottle pictured is an example of this class. When brought into proximity with the closed manifold described above, it acts at once to disrupt the closure of the bottle, obviating the outdated, dualistic paradigm of distinction between interior and exterior, thus enabling interaction between the beer and the self.
In summary, we have here a Klein bottle that opens beers. If I do say so, this is fine art.
Klein Bottle Opener metal print, 3" tall - $255
A tip of the manifold to the Acme Klein Bottle company. Add a Klein Stein to complete your nonorientable drinking experience!
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