Möbius Strip VII (variant A)
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This Möbius strip is closed by a very simple lock which is based solely on friction of the paper and the tension of the twisted strip. There are no tabs and pockets or any other similar locks. The mechanism can in theory work for a non-twisted strip, but the torque of the twist helps a lot, as does folding from thick, stiff paper. There are several variants which I plan to publish soon, all based on the same basic idea.
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