Once upon a time, there were two sets of railroad tracks that ran parallel to each other for miles and miles. Trains would travel along each set of tracks in opposite directions, but the tracks never crossed. The two sets of tracks were so close that people often joked that the trains on one set could shake hands with the trains on the other set.
One day, a group of tourists were riding on a train that was traveling along one set of tracks. As they passed the other set of tracks, they noticed something strange: the two sets of tracks were getting closer and closer together. In fact, the tracks were so close that they were practically touching!
The tourists were puzzled by this, and they asked the conductor about it. The conductor shrugged and said, "I don't know what's going on. Those tracks have been like that for years. They've never crossed the train before, and I don't think they will today."
But as the train continued down the tracks, the tourists couldn't help but feel nervous. They watched as the two sets of tracks got closer and closer, until they were sure that the train was going to crash. Just when they thought it was all over, something amazing happened: the two sets of tracks suddenly separated again, and the train continued safely on its way.
The tourists were amazed by what they had just witnessed. They couldn't understand how the two sets of tracks could get so close without the train crashing. They asked the conductor again, "How does this work? How do the tracks never cross the train?"
The conductor just chuckled and said, "It's simple. The tracks are on two different levels. One set is on a higher level than the other. That's why they can get so close without ever crossing the train."
The tourists were embarrassed that they hadn't thought of this before, but they couldn't help but laugh at themselves. They had been so worried about the tracks crossing that they hadn't considered the obvious solution.
From that day on, the tourists had a new appreciation for the ingenuity of the railroad system. They also had a good laugh about how they had been fooled by a simple optical illusion. And whenever they saw the two sets of tracks that never crossed the train, they couldn't help but smile and remember their silly mistake.
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