The paradox of nine copper coins

Chuangren is a fictional race. Their orthodox philosophy opposes materialism and thinks that a thing does not exist until it is perceived by anyone, so a copper coin does not exist from the time it is lost to the time it is discovered.

Materialist heretics put forward a hypothesis, namely the paradox of nine copper coins. Because it rained on Wednesday, the copper plate rusted, which proved that the copper plate always existed from Tuesday to Thursday. Because this is a materialistic view, founders can't understand it.

This story is a paradox for creators, but not for humans, because their philosophical basis and world outlook are different.