Two Klein bottles, 1995.
© Science Museum / Science & Society Picture Library
Two single surface glas vesels made by Alan Bennett in Bedford, United Kingdom. Part one is a double loop Klein bottle which when cut gives a pair of three-twist Mobius strips. Part two is a triple loop Klein bottle which when cut gives a pair of five-twist Mobius strips. A Klein bottle is a surface which has no edges, no outside or inside and cannot properly be constructed in three dimensions.