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TRIZ 40 Principles

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14. Spheroidality

We tend to like flat surfaces and often do not challenge them. Spheroidality asks us to consider curves, in all of their various forms. We can use ball bearings to reduce friction, bend metal smoothly to retain strength or move things around in smooth curves rather than angular jerks. Where there already is curvature, change the radius, or let a flat curve take off into another dimension.