There’s an indoor lamp without a cover hanging from the ceiling. Only two out of four possible bulbs are installed. There are burned-in soot marks leading from the wall to the ceiling.
NemZ: I thought that was black mold. This just rouses the further question of what the hell was burning to leave that much soot residue... perhaps a grease fire? Was it something that Rei did or is it leftover from previous tenants?
Kendrix: The incomplete lamp only confirms that she doesn't have much of a desire for light, nor for aesthetics (no covering, no interest in cleaning away the soot... it looks rather like that black tarp in her lab room next to what probably used to be her bed...) Also, who has that sort of light tubes in their homes? That sort of lighting is more reminiscent of cellars, hospitals or un-personal, public places... and yes, labs.
As for the source of the soot, it kinda looks like what accumulates over a heating after many years, with the lack of light making it look worse than it is... When we repainted a few rooms in our house, I noticed that the wall is always dirtier above the heating. Not sure if there's even a heating beneath it, tough. Might've been any sort of domestic accident.