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A flexatube is a simply made puzzle consisting of 4 squares (about 3cm x 3cm) which have been folded along the diagonals IMG:flexatube2.png and fixed into a tube. IMG:flexatube1.png By a sequence of folds the tube can be turned inside out. There are various solutions. One can be seen at http://uk.youtube.com/watch?v=l9ukpwanFlo ---- One of the Enrichment tasks on this site.