Two spheres
Model 461
Description
Two spheres from which one (with hole) is flexible.
Showcase of this model is Case number 42
References
Hilbert, D.; Cohn-Vossen(1932). Anschauliche Geometrie, Springer-Verlag, Berlin, p. 203. Online version
Two spheres from which one (with hole) is flexible.
Showcase of this model is Case number 42
Hilbert, D.; Cohn-Vossen(1932). Anschauliche Geometrie, Springer-Verlag, Berlin, p. 203. Online version