Mathematics in Metal
A mathematical surface known as the Klein bottle is like a mischievous, mathematical cousin of the Moebius Strip, where the inside and the outside are the same side. Among topologists, the Klein bottle is well known as an example of a closed, nonorientable surface. Thanks to artist Bathsheba Grossman, whose sculptures bring mathematical abstractions into the real world, this curious surface has also become the life of many a party.
For more on the work of Bathsheba Grossman, see this article from PNAS.