 A mathematician named Klein
 Thought the Moebius Strip was divine.
 He said, "If you glue
 "the edges of two
 "You get a weird bottle like mine!"

Take two disks. Deform each one just a little until they are
bowls. Disks only have one edge, so each bowl has only one
edge, so now glue the edge of one to the edge of the other,
and what you get is a sphere (well, distorted somewhat).
Since each disk has two sides the sphere also has two sides,
only now it's an inside and an outside.
Got that?
OK, now consider the Moebius Strip. Just as a disk has only
one edge, so the Moebius Strip has only one edge. We can
imagine taking two Moebius Strips and gluing the edge of one
to the edge of the other. It's a bit hard to do in reality
because the twistiness gets in the way a bit, but we can
imagine doing it (drawings will be provided here as soon as
someone asks for them  click on the Edit This Page link
at the bottom of this page and fill in the form)
The result is called a Klein Bottle, and it's
pretty hard to visualise in all its detail.
Here are a couple of pictures.

This one was drawn by Tom Banchoff and classes as instructive,
artistic and inspired. I am somewhat in awe of this picture,
having myself tried in the past to draw pretty Klein bottles
and having failed miserably.

Visit Tom's page on the Klein bottle at:
There you can also find animations of klein bottles which
help enormously in understanding this particular projection
into 3space.
On the remainder of this page I want to talk about Klein
bottles, their different representations and their
relationships with Moebius Strips. In particular I want to
talk about the three or four common embeddings of the Klein
bottle into the usual 3dimensional space, and the ways of
viewing them in 4dimensional space.
Then we want to talk about generalising processes. We've
talked about gluing two disks together to get a sphere, and
gluing two Moebius Strips together to get a Klein Bottle.
What do you get when you glue the edge of a Moebius Strip to
the edge of a disk? You get a Cross Cap or Projective Plane.
This page should also reference the pages on Mathematics and
Topology. It's also worth noting that this Klein is the same
Klein as appears in Colins Mathematical Ancestry.
See also http://www.google.com/search?q=%22Klein+Bottle%22
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