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The acid-umbrella is designed to warn people of the environmental threatacid water. When the surface of the umbrella got acid rain, the green natural patterns on the surface would change into an industrial polluted world with heavy smoke. It raises the attention to this problem, encourages more people to protect the environment. Whichever part of the surface got wet by acid rain, it will merge into a heavily polluted scene, if the rainwater quality is good, and the surface will just remain the beautiful natural scene.