Isolation okay if self chosen. Prison is not okay chosen by others to lock someone up

 Animals and children isolate themselves in boxes, closets, under the bed, tent, any covered structure for fun and safety

Adults sometimes coop themselves up in cages often the television set computer cell phone tablet pad screen, vehicle van car train airplane helicopter chopper submarine, body of water boat ship Cruise, 

Jail is done by law enforcement authority when perpetrator goes against the law of the human