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In page Lotus Seven:

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It is a stressed skin construction,[citation needed] in which the flat aluminium body panels, and especially the floor, stiffen and effectively triangulate the largely rectangular steel tubular frame structure. This gives a rigid frame with few tubes and very little bodyweight that does not contribute to the frame stiffness. The flat panels avoid difficulties in shaping aluminum sheet into smooth compound curves. On the downside, it does not allow attractive curves or streamlining.