Göttingen Collection of Mathematical Models and Instruments

Case number 28

Eversion of the sphere Klein bottle (cut in half) Boy's surface of degree 6 Klein bottle
Crocheted model of hyperbolic surface Two-sided surface with the clover leaf sling as boundary curve Clover leaf sling on torus Clover leaf sling on torus
Model of a clover leaf sling with singularity-free surface 3-times twisted Möbius strip with clover leaf sling as border Knitted Möbius strip Three Möbius strips
Three Möbius strips Three Möbius strips Möbius strip
Wooden ring with 7 neighbouring areas Wooden ring with 7 neighbouring areas Three rings that are devoured with each other, but not pairwise
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