%moebiu%

n. [ From August F. Möbius, a German mathematician. ] A mathematical object, or a physical representation of it, which is a two-dimensional sheet with only one surface. It is constructed or visualized as a rectangle, one end of which is held fixed while the opposite end is twisted through a 180 degree angle and joined to the fixed end. It is a two-dimensional object that can only exist in a three-dimensional space. [ PJC ]

The moebius strip was the subject of a famous woodcut by M. Escher, published in 1963. See Moebius Strip II. [ PJC ]