Depression is like a frozen shoulder - a dull, continuous condition that functions like a black hole, nothing escapes. No insight, no nuance - nothing.
I awoke depressed this morning, just as the weather seemed dull and overcast. Depression is defiant to my analysis. Firstly, it's a challenge to recognise it's true cause. For that I trace back over my previous day until I find the moment, the comment, the thought, the situation that triggered it's onset.
Secondly, it appears to have no nuance, no differentiation.