I read about a study that talked about how body-to-body communication significantly affects the outcomes of therapy and mediation sessions.
When there is positive body-to-body communication involved, it makes therapy sessions and mediation sessions much more successful and fruitful.
I guess there is something about sitting close to someone, looking at them and watching them that influences how we think and feel. I've experienced this personally with my counselor who is a very kind and positive person. He always smiles, listens to me and says supportive things. It's his facial expressions and body gestures that makes me trust him and feel safe enough to express my emotions. It's really nice to be in such a person's presence.