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This transition reflects the process of people’s growing up, when they come into contact with the outside world, light can gradually pass through the hollow of the top, implying the exploration of the world.
In this corridor, the dark corridor itself implies the process of our growth, especially before people were exposed to social circles.
When people walk through the corridor, the light will pass through the hollow part at the top, indicating the process when people gradually grow up and start to contact with the outside world and socialize with different people.