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People who have never been in solitary confinement don't know the terror of it being tightly closed, and those who have can't describe that terror to others because so many things can never be truly understood without firsthand experience.
The consequences of solitary confinement can be unpredictable since the conditions of the cell vary, as does the tolerance of the person confined, leading to differing outcomes.
Yang Yi's room had nothing in it, and if he wanted to lie down he could only do so on the floor without being able to stretch out his legs, but sitting on the floor was not a problem, and standing didn't quite reach his head. With a small window and a toilet, this was already one of the better solitary cells.
If one were in a solitary cell without a single ray of light, after seven days a person could indeed go mad.
Yang Yi decided to try and see what the feeling of being in solitary was really like, so he began to embrace solitude.