With a just bit of heat, the flat strip of rubbery material folds itself into an origami swan. But the trick's not over yet, because that very same rubbery strip can be taught a new transformations.

Fold an A4 sheet of paper in half, and then in half again. Unfold the paper once so that you have an A5 size with a fold mark down the centre. With the folded side furthest away from you, fold the top ...