Prison is far from pleasant, but things sink to an extra nasty level when prisoners are taken out of the yard and put into solitary confinement. Solitary confinement was originally a form of punishment practiced by Quakers and Calvinists who wanted to afford prisoners the quiet space to evaluate their actions, presumably while praying. Some religious sects, such as the Amish, still use forms of social isolation to punish offending members of their community, and it can wreck the psyche of those ostracized. Still, these practices don't hold a candle to the United States prison system, which takes solitary confinement to an inhumane level.
These days, solitary confinement goes by a more PC name - segregation - but it takes no less a toll on the prisoners unfortunate enough to be separated from the general population and subjected to total isolation for weeks, months, and even years. Various studies have shown that putting prisoners in SHU or other forms of isolation are not only incredibly damaging to the prisoner's psyche, but is also incredibly expensive and counterproductive to what prisons are supposed to be doing: rehabilitating prisoners to become functioning and contributing members of society.
You want to know what solitary is like? The best way to find out is to ask those prisoners who've been forced to live it firsthand.
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Solitary Confinement Stays With You, Even After You’re Out Of 'The Box'
Cesar Francisco Villa Spent 11+ Years In Solitary Confinement And He Said It's 'Suffocating'