Three Klein bottles arranged in a column which when cut form a pair of five-twist Mobius strips. Klein bottle, 1995-1996. Mathematics 1995-1996

One of nine single surface Möbius strip models showing a one-sided surface, three edges, three loops, one twist, 1967. One of nine single surface Möbius strip models Mathematics 1967

Klein Surface, one of three single surface models made of coloured wire mesh. Klein Surface, one of three single surface models Mathematics 1967

One of nine single surface Möbius strip models showing a Multiple Möbius band (Bill's surface) one edge, three loops, three twists, 1967. One of nine single surface Möbius strip models Mathematics 1967

One of nine single surface Möbius strip models showing a, one sided surface, one edge, two loops, one twist, 1967. One of nine single surface Möbius strip models Mathematics 1967

One of nine single surface Möbius strip models showing a one-sided surface, two edges, two loops, two twists, 1967. One of nine single surface Möbius strip models Mathematics 1967

One of nine single surface Möbius strip models showing a one-sided surface, two edges, two loops, one twist, 1967. One of nine single surface Möbius strip models Mathematics 1967

Heptahedron, one of three single surface models made of coloured wire mesh. Heptahedron, one of three single surface models Mathematics 1967

Steiner's surface, one of three single surface models made of coloured wire mesh. Steiner's surface, one of three single surface mod Mathematics 1967

One of nine single surface Möbius strip models showing a Mobius Band, one edge, one loop, 1967. One of nine single surface Möbius strip models Mathematics 1967

One of nine single surface Möbius strip models showing a one-sided surface, two edges, three loops, two twists,1967. One of nine single surface Möbius strip models Mathematics 1967

One of nine single surface Möbius strip models showing a cylinder, 1967. One of nine single surface Möbius strip models Mathematics 1967

One of nine single surface Möbius strip models showing a Multiple Mobius Band, one edge, three loops, three twists, 1967. One of nine single surface Möbius strip models Mathematics 1967