Philosophical presentism is the view that only present entities exist (or, equivalently, that everything is present). According to presentism, there are no past or future entities. In a sense, the past and the future do not exist for presentists—past events have happened (have existed) and future events will happen (will exist), but neither exist at all since they do not exist now. Presentism is a view about temporal ontology that contrasts with eternalism —the view that past, present and future entities exist (that is, the ontological thesis of the 'block universe')—and with no-futurism —the view that only past and present entities exist (that is, the ontological thesis of the ' growing block universe ').