Huh, I didn't even know you could do that with the chair in that room.
I'd say it was because of how driven I was by my morbid curiosity at this point but I, rather embarrassingly, somehow didn't understand what was happening in the Black Album photos very well the first time I played that part of the game. Nobody I've watch play it seems to have had that issue though so I was probably just being weirdly bad at parsing visual storytelling there.