| Moebius Strip; a flat ribbon which is twisted through 180 degrees and then rolled along it's length so that both ends meet. It has only one side and one edge. |
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A variation on the theme of the Moebius Strip. This model is triangular in section and twisted through 120 degrees, but still has only one side and one edge. |
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A 3D optical illusion in the
style of Escher |