Abrupt out-of-plane edge folding of a circular thin plate: Implication for a mature Victoria regia leaf Pengfei Yang, Chen Zhang, Fei Dang, Yuan Yan, Yilun Liu and Xi Chen Eur. Phys. J. E, 39 9 (2016) 85 Published online: 16 September 2016 DOI: 10.1140/epje/i2016-16085-6