“In the future, robots must be able to solve tasks in deep mines on distant planets, in radioactive disaster areas, in hazardous landslip areas and on the sea bed beneath the Antarctic”—as well as in the cracks of otherwise inaccessible archaeological sites. We need to send machines capable of not exactly of replication, but something more like budding or fruiting, using 3D printers. Imagine a robot being sent into “the wreckage of a nuclear power plant,” for example, where it encounters a stairway it had not been anticipating needing to climb. For the moment, it’s stuck. So what does it do? “The robot takes a picture. The picture is analysed. The arms of one of the robots is fitted with a printer. This produces a new robot, or a new part for the existing robot, which enables it to negotiate the stairs.”

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