"Of course. We don't want people hurt when they try this. And while our finished versions would actually ideally be linked in to a person's nervous system, the arm still has to be able to have minute degrees of function," David explained. "Small subprocessing programs that read tension and give and the like is one of the routes we're exploring. Human minds do so much by instinct and experience that we never begin to process that even picking something up involves so many tiny calculations."

As he says this Andy seems to get a feel for Otto and adjusts its grip slightly. Then it starts to exert what is deemed just enough pressure to slowly overtake Otto's hand.