A three-dimensional shadow of a four-dimensional Klein bottle.
Etruscan Venus Surface
See also
Ida Surface, Klein BottleExplore with Wolfram|Alpha
References
Peterson, I. Islands of Truth: A Mathematical Mystery Cruise. New York: W. H. Freeman, pp. 42-44, 1990.Referenced on Wolfram|Alpha
Etruscan Venus SurfaceCite this as:
Weisstein, Eric W. "Etruscan Venus Surface." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/EtruscanVenusSurface.html