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Mobius returns to the office, cuts out the note, reverse the end of the paper 180 °, and then sticks the front and back of one end. Essence After the circle was made, Mobius caught a small beetle and put it on it to climb it. As a result, the little beetle climbed all parts of the circle without turning over any border. Mobius said excitedly: "The fair beetle, you can noisy prove that there is only one face in this circle." The Mobius circle was discovered.