What’s the opposite of a submarine? Because someone made one for goldfish. Basically it’s a fish tank sitting on wheels–a tank tank you could even say–with a camera suspended over the top. The camera watches the direction the fish inside the tank is trying to swim in, and it steers the robot in that direction. Speed is dictated by how close the fish is to the edge.
Goldfish are not, despite popular perception, stupid. There’s no reason one couldn’t learn to “drive” a robotank around, although the limiting factor would be the water, given the lack of a filter.
I, for one, welcome our new aquatic-robotic overlords.