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I don't understand why the article and everyone here are talking about spheres. Balloons come in all possible shapes, and in fact the most common birthday balloons are not spherical. Can't they engineer a balloon which has a parabolic surface when inflated?

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I think that requires a lot more pieces and engineering in order to work properly

What do you mean? We can make party balloons and long balloons for balloon animals without any additional pieces.

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