What does it mean that the present always changes? Are the future and the past as real as the present? Our intuitions seem to clash with our best scientific theories: as Einstein famously said, after the Theory of Relativity the distinction between past, present and future is only a stubbornly persistent illusion. But then, if we do really live in a Block Universe, why do we experience time as passing? Eternalism is often dismissed as too 'static' to capture the lived phenomenology of temporal flow. In this book, the author offers a metaphysical defense of Eternalism, together with a detailed account of how the passage of time might be experienced within a Block Universe.