If you were to build a platform above the balloons, surely you'd want 3 balloons? 2 points describe a line, and the platform wouldn't be stable if it was only supported on one axis. 3 points describe a plane -- and that's what we'd be looking for here....
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If you were to build a platform above the balloons, surely you'd want 3 balloons? 2 points describe a line, and the platform wouldn't be stable if it was only supported on one axis. 3 points describe a plane -- and that's what we'd be looking for here....