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Second level normal tetraflexagon

The generic second level tetraflexagon has twelve faces, and is still quite easy to fold up from a previously prepared strip of paper.


  
Figure 13: Since each edge of the first level tetraflexagon spawns two new vertices, the full second level tetraflexagon has 12 vertices.
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Figure 14: Permutation of the squares along the strip for a normal second level tetraflexagon. They run in order, subject to packages being flipped over.
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Figure 15: Strips from which the second level tetraflexagon can be folded. One strip folds into a single sector, so two are needed altogether.
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Figure 16: Back side of the two strips for the second level normal tetraflexagon. One sector per strip.
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2000-09-05