  Thin vegetal shells have recently been a significant source of inspiration
for the de\text{sign} of smart materials and soft actuators. Herein is
presented a novel analytical family of isometric deformations with folds,
inspired by a banana-shaped seedpod, which converts a vertical closing into
either an horizontal closing or an opening depending on the location of the
fold. Similarly to the seedpod, optimum shapes for opening ease are the most
elongated ones.
