Exact non-Hookean scaling of cylindrically bent elastic sheets and the large-amplitude pendulum Am. J. Phys. 79, 657 (2011) The Cramster Conclusion Phys. Teach. 49, 291 (2011) Strain in layered zinc blende and wurtzite semiconductor structures grown along arbitrary crystallographic directions Am.The profiles of the edge of rectangular sheets of paper folded so as to join opposite edges were measured and compared with the profiles calculated with the theory of elasticity. I show how the calculation can be accomplished by using the aspect ratio of the loops as the only input parameter.