A 'black box' describes the state of mind one can
experience that is
associated with isolation, pain,
frustration, and other negative synonyms of the like.
It describes how one feels when they are trapped, obstructed, or even empowered (even if empowerment is false) by something that is affecting them psychologically.
Person 1: I find myself returned to my 'Black Box'. I forgot how I got here, or how I ever even found it in the
first place. When I'm here, I don't feel like myself. But to tell the trurth, I still am, myself.
Person A: "Daryl's going to the 'Black Box' again... should we help him?"
Person B: "Nah, he can let himself out of it
eventually, he's used to it. It's probably for his benefit,
it's all he knows anyway. Just let him be."