|A Moebius Strip has no inside or outside.|
- one sheet of paper (it's nice to have something big, like easel paper or a newspaper)
- tape or glue
- pen, pencil or marker (best not to use a marker that bleeds through)
Step 1: Cut a long, narrow strip of paper (about 2 inches wide).
Step 2: Grasp each end of the strip and twist one end so that it is turned over (i.e., give it a half-turn).
Step 3: Tape or glue the ends together flat.
Step 4: Point out that what seems to be the inside of the loop becomes the outside, and vice versa.
Step 5: Have the kids take a marker, pen or pencil and, starting in one spot of the strip, continue all the way around, until they meet back up with the starting point. This proves that a Moebius strip really has only one side!
Step 6: Pinch together one part of the strip and begin cutting to make a hole. Then insert the scissors and cut all the way around the strip. Shouldn't this cut the Moebius strip into two separate pieces? No! You just end up with a single strip that is twice as long.
Step 7: EXTRA CREDIT -- If your new strip is wide enough, begin this process all over again. You may find a nice surprise! (Do you want a hint? You should end up with two linked loops!)
For more info see this article. They are not only interesting, they also have practical applications. There are