gloom
... that people tend to see the world as a grey gloom when they are depressed?
... that people tend to see the world as a grey <b id="mwGvw"><a href="./Gloom" id="mwGv0" rel="mw:WikiLink" title="Gloom">gloom</a></b> when they are <a href="./Depression_(mood)" id="mwGv4" rel="mw:WikiLink" title="Depression (mood)">depressed</a>?