I’m not sure where you’re located, but if you want to be able to see both walls, you’ll need a large mirror with a wood frame, mounted on one wall.
assitant
So here’s a visual example of what I mean by making the room feel larger vertically.  If I placed a mirror on the wall here, and then the bathroom and closet are here and here, we’d have this effect.
assistant
How should I install a mirror in a room to make it look bigger?
user
Well, that depends on what you’re trying to accomplish.  It sounds like you want to use the mirror to make the room feel larger.  And you mentioned that the room has an adjoining bathroom and an open closet, and that you’re interested in seeing the room both when you’re sitting down and when you’re standing.  So what I’m hearing is that you’re trying to achieve a feeling of openness, both vertically and horizontally.  Would you be happy to see a different direction in the mirror, like the opposite wall, or both wall and ceiling?  I’d be happy to help.
assistant
Yeah I am.
user
Ok, let’s go through the various options one at a time, and you can let me know if one sounds promising or unsatisfactory.
assistant
ok thanks
user