"I once read an account by someone who said their mood was correlated with how many rooms they had been in that day. If they spent the whole day in their bedroom, by the end of the day they’d feel terrible. If they made it to their kitchen, they’d feel a little better. The local cafe, better still. They seemed to feel some direct treatment effect from “novelty”, even the novelty of a different room in their house. I have never forgotten this and it strikes me as borne out by my own experience and that of my patients."

Source: Peer Review Request: Depression