In one large aquarium, one pike fish was kept. At first, he was allowed to freely enter the aquarium, then half of the aquarium was separated by thick transparent glass. A pike whose swimming distance is reduced and the obstacle is not visible will constantly bump into it to get to the other side of the aquarium. For a long time, the poor pike tried his best to break through the barrier, and stopped trying to break through. Then, the researchers removed the glass separator, and the pike stopped going near it, let alone trying to get to the other side. He did not take advantage of the opportunity to swim under the whole large aquarium, but only stayed in this small part and did not go to the other part. Are you uncomfortable?