Conditional Reality

We found many rocks stacked up in the basement after we came home from the funeral. No one in the house seemed to know how they got there. We unstacked them and went to bed. The next morning they were stacked up again, which made us feel creepy, that there were people coming into the house without our knowing it. We changed the locks and bolted the windows. The next day we found even more stacked rocks. We looked down at our hands. They were covered in dust. We spent hours trying to wash them clean, but never managed it.