Total institutions create and use for their operation a range of natural and artificial barriers. A place where the number of barriers is relatively the greatest is penitentiary institutions that are located on islands. In addition to the artificial barriers created by man, natural barriers (water and adverse climate) in such institutions play the same role in isolation from the world. Employment of that form of penitentiary isolation is usually a revenge taken by society (authority) against the persons being convicted for the most serious crimes in a given legal system.
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