 Typical temporal parts theorists argue that such indeterminacy results from a mismatch between human language and temporarily-coincident objects (of the sort discussed in  section 4.1).  Take a building which slowly crumbles away to nothing. According to most temporal parts theorists, there are very many ‘nested’ four-dimensional objects involved in this process, some of which end before others do. We are unclear about when the building ceases to exist because our use of language just doesn’t determine which of these many four-dimensional objects is ‘the building’.