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| University of Cambridge > Engineering Department > Photo competition |
 Keith Seffen: A morphing shell, by dimple inversion |
| Keith Seffen A morphing shell, by dimple inversion A thin sheet of copper alloy is first dimpled using a hammer and punch, to render a golf-ball-like surface. Each dimple can then be inverted by hand back and forth, and depending on the orientation of clusters of dimples, the sheet is either cylindrical, partially curved, or flattened. This operation affords a metallic skin capable of radical changes in shape. |
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