He describes it as "one surface folded in an endless Mobius band, " or sort of a giant figure 8.

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Imagine an elastic band stretched over the surface of an apple.

ECONOMIST: Proof of the truth of the Poincar�� conjecture

Microsoft did not launch Surface with a sponsored TV program or hire a popular band to play for the press.

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The band can slowly shrink, moving as though it is slipping from the surface, until it becomes just a dot on the apple's skin.

ECONOMIST: Proof of the truth of the Poincar�� conjecture