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Here’s one from the “because it’s there” department. Visitors to London’s Festival of Extreme Computing discovered last week that a bionic fish cake is roaming the Mediterranean. Electronic artist Paul Granjon fitted an ordinary fish cake with an electric motor, a propeller and a battery. Everything apart from the propeller was sealed inside a waterproof bag. At the festival, which serves as a showcase for marvellously inappropriate technologies, Granjon showed a video of his robo fish cake being released into the sea near Marseille. “Ideally it would be nice for it to swim until it dies,” he says of his reanimated fish product. “Its battery will run out or it will leak.” His latest arty invention is a “cybernetic parrot sausage”: a sausage stuffed with the electronic innards of a…