They're very soothing. About the size of a large grapefruit, the robot jellyfish gently moves up and down its tank when the aquarium lights are turned on. Thanks to sensors, it doesn't touch the sides. They 'swim 'gently around the aquarium until they run into the side wall or another creature, when a nose-mounted sensor turns them around and they gently move off in the other direction. Takara , the third-largest toy maker in Japan, expects the Aquaroids to be a big hit.
Users say watching the jellyfish can be as hypnotic as staring at the real things.
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