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A floral mimic made of paper–plastic bilayer petals shows a controllable blooming and wilting response. When dipped in water, the petals open and the flower blooms, while when the water supply is exhausted, the bilayer dries out and the flower closes (see electronic supplementary material, movies S6 and S7). The length of the petals is about 4 cm, and the typical time scale of a cycle is an hour.
