This area was most likely the central chapel originally; the wall on the right seems like a later addition. With some heavy curtains and a small projector this room could have been a theater for the disabled soldiers staying at the hospital when it was last in use.
One more thing. It is important we all have different experiences. While a few people may like being restrained, some feel trapped. For many it reenacts trauma from past abuse. This is true for people with mental illness, DD, children, whoever.
almost every psych hospital has seclusion rooms. Hospitals which are better managed and aren't overcrowded use them less. Hospitals where the staff are well trained in conflict management and trauma use them less. Hospitals that involve the patients in their treatment plan use them infrequently. A few including a few forensic hospitals don';t use them at all. On the other hand, on the extreme some hospitals use them as punishment for not following rules or talking back. Both staff and patients are sometimes injured, Patients are sometimes stripped of their clothes and traumatized. Seclusion and restraint are horrible. Many mental health professionals and patients view S&R as treatment failure. African American and Hispanic patients are restrained and injured significantly more than whites. Today patients are still killed. More often they are not used anymore as punishment. They are used when a person is agitated or angry or is hurting theirself. Some places are trained to teaching patients skills to deal with their emotions effectively instead of acting them out, Those are they hospitals where they are seldom used. they are used in special education, and sometimes children suffocate. Very sad. Their is a movement to change seclusion rooms into comfort rooms. There may be stuffed animals to hold, murals on the walls or soft colors and a comfortable chair or two. The client has the freedom to go in the room and deescalate if they are frustrated, or ground themselves if they are frightened or feel like hurting themselves. I go through difficult periods when i am in the hospital, but i have never seen a comfort room. It would be nice,