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If you refer to real life there is also no way you can fold a piece of paper to form a hemisphere.
As far as ProE/sheetmetal is concerned you can make a 3D deformation by using a die you press in, a feature that can be undone when flattening the part. But the inner workings of ProE are such that this deformation doesn't consume any material. More : it even keeps wall thickness equal. And I'm pretty sure that deep-drawing sheetmetal in real life doesn't work this way.
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