A Möbius Strip is a strip with only one side. You can make a Möbius Strip by taking a long strip of paper, making a 1/2 twist, and attaching the ends together.
Try this. Make a Möbius Strip and draw a line down the middle. Cut along the line. What happens?
Try this. Get a long strip of paper and color a band down both sides. Make a Möbius Strip out of the paper strip. Cut out the band. What do you get?
When you join two Möbius Strips by their edges, you get a Klein Bottle. If you pour water in the bottle, it doesn't go in. (Use clay, not paper!)
Made with Bryce 3D