Dr. Robert Lang, creator of delightful Origami insects and several Origami books & CD's (including Origami Design Secrets) has made an Origami Klein Bottle!
From a single sheet of paper with no cuts, Dr. Lang made this fully interlocking Klein Bottle. It's a gem!
Like Robert Lang's insects, this is a nontrivial folding. But yes, you can fold this yourself... See Robert Lang's folding instructions for the Origami Klein bottle! .
This Origami Klein Bottle is not for sale, but Robert Lang's crease patterns (opus 444) are available at his website.
Other Klein Bottles can be found at Acme Klein Bottle's Home Page
last updated July 25, 2021 to fix an index.htm problem