Edit made on November 26, 2008 by DerekCouzens at 20:49:31
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A flexagon which can reveal six faces with four edges.
A flexagon with four edges which can reveal six faces.
A video of the construction and use can be found at: http://www.metacafe.com/watch/1007181/the_best_of_paper_toy_just_one_piece_of_paper_no_glue_6_face/
One of the enrichment tasks on this site