Klein bottle
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In mathematics, the Klein bottle is an example of a surface with no distinct inside or outside. In other words, it is a one-sided surface which, if traveled upon, could be followed back to the point o
Immersed Klein bottles in the Science Museum in London
A hand-blown Klein bottle
The pinched torus immersion of the Klein bottle
Boy's surface
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In geometry, Boy's surface is an immersion of the real projective plane in three-dimensional space. It was discovered in 1901 by the German mathematician Werner Boy, who had been tasked by his doctora
Klein bottle
…Bavard's Klein bottle systolic inequality Boy's surface Imaging Maths - The Klein Bottle…
Model of a Boy's surface in Oberwolfach Research Institute for Mathematics