These sorts of structural deformations are not new — researchers have already demonstrated “memory” and “smart material” properties. One of the most popular technologies is known as shape memory alloy, where a change of temperature triggers a shape change. Other successful approaches use electroactive polymers, pressurised fluids or gasses, chemical stimulus and even in response to light. — kurzweilai.net
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4D printing is so Wednesday. It's all about 5D printing now.
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