Inside the box, the scientists created a trail with their artificial fish, which was essentially a rubber fin on a stick that created a trail similar to the swimming motion of a real fish.
在那个盒子里，科学家用假鱼设计了游动轨迹，基本上，那是由橡胶鱼鳍形成的，和真正的鱼游轨迹十分相似。
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An arc motion would make people's gaze stick to the curving hand and stay there, while a straight line would make their eyes flick back to the beginning and jump between the two.
When system is in stick-slip motion, the system response can be periodic, quasi-periodic and chaos with the change of pulling velocities, system stiffness and viscous.