Boy's Surface represents an immersion of the real projective plane in the three-dimensional real space. It was constructed by Werner Boy in 1901. There is a whole web page on this interesting surface. In front of the mathematics research institut in Oberwolfach, Germany, you can see a model of this surface.
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All images are created by Oliver Labs using the software surf written by Stephan Endrass and others.
Here is the surf source code of the image above.
Oliver Labs: my homepage: OliverLabs.net, my e-mail: suse TheAtSymbol OliverLabs.net