[pstricks] Drawing a Klein Bottle

[Rich Shepard]

   Several months ago I found a nice image of a Klein bottle drawn with
gnuplot, but the code was no longer available on the Web. So I searched for
PSTricks code to draw one rather than re-inventing the wheel, but did not
find any.

   Has anyone drawn such an image with PSTricks? If so, may I use and modify
the code? If not, please pass me a pointer where I should start to create
this image. The gnuplot version is attached as a .jpg file.

TIA,

Rich
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