 Vagueness often occurs at the beginning and ending of existence. It is notoriously controversial whether there is a precise moment at which human people begin to exist, and if so when that moment is. But most of us will have a grey area at the end of our existence, a few seconds, a few minutes, or even longer during which we seem to be neither clearly alive nor clearly dead. More mundanely, formation and decay are gradual processes for many kinds of object, both natural and artificial: think of a lake or haystack which gradually comes into existence, or a building or a rock formation which slowly crumbles away. Let’s call this phenomenon ‘fuzzy temporal boundaries’.