The Klein bottle is a geometrical object, named after the German mathematician Felix Klein. He described it in 1882, and named it Klein‘sche Fläche (Klein surface). Like the Möbius strip, it only has one surface. Because the surface is non-orientable, there is no “inside” or “outside”. Executed in clay to see if it was possible after having seen this figure rendered in clear glass. Begun on the potter’s wheel and finished by hand building the “neck” of the bottle.