Christmas present idea. Love the description.
Boundary-less Beer Bottle Opener of the Day: The boundary-less, non-orientable object known as the Klein bottle, engineered by Bathsheba Sculpture to solve the problem of beer being kept from you by “a boundaryless compact 2-manifold homeomorphic to the sphere” (AKA a “beer bottle”).
The Klein Bottle Opener disrupts the continuity of the beer-bounding manifold, “canceling the outdated paradigm of distinction between interior and exterior,” and enabling “the desired interaction between beer and self.”
Also: It looks really cool.