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How to make a mobius strip
Cut a strip of paper about 6 inches (15 cm) long and 1.5 inches in width.
When cutting the strip, the measurements do not need to be accurate, these are just suggested. Try to keep the width even so that you have a long thin rectangle.

OPT:
[+] To simplify the process, you can simply cut down the edge of a plain sheet of paper to make your strip. Label the corners of the strip a, b, c, and d.
[+] Lay the strip flat on a flat surface so that when you rub the strip with your fingers, it will move around as a book, picking up any dust or dirt as you go. While there are many different types of chapters, peeled and cut strips are the most common.
[+] You can use scissors or permanent markers for this part. An example of an effective mobius strip strip is 2.6 inches (5.08 cm) long by 4 inches (10 cm) wide.
[+] You can cut strips in any size you want. For example, a strip may be about 18 inches by 11 inches in length with a length of about 2 yards.
To simplify the process, you can simply cut down the edge of a plain sheet of paper to make your strip. Label the corners of the strip a, b, c, and d.