“Don’t talk too loudly or move too fast”, whispers Professor Tim Landgraf from the Freie Universtät Berlin. “Otherwise the fish will freak out.” He has just pulled up a large curtain which is surrounding a big tank with four small fish. Well, there are three of them, because one of the fish is actually a robot that is moved back and forth with the help of a magnet underneath the aquarium.
The goal, Landgraf explains, is to make the robot fish as much as possible a part of the group of the real fish in order to map the behaviour of the school of fish. “We’re getting better and better at it,” he says. The robot fish is becoming more and more accepted as a group member. It was a matter of taking small and bigger steps. When the fish got realistic large round eyes instead of painted dots, it proved to be an enormous leap forward. “That’s what the other fish were scared to death of.”
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