(a) A piece of paper is cut into a serpentine. (b) When pulled, the serpentine elongates by twisting out of plane. (The reader may wish to try this experiment to see the serpentine twist in three dimensions.)

Source: Teng Li, Z. Suo, Stephanie P. Lacour, Sigurd Wagner, Compliant thin film patterns of stiff materials as platforms for stretchable electronics. Journal of Materials Research, 20, 3274-3277 (2005)