How does time pass? Does time itself move, or is time's passage merely an illusion? Analytic philosophers belong, for the most part, to one of two camps on this question: the tensed camp, which defends the reality of time's passage, conceiving the present as "ontologically privileged" over the past and future; and the tenseless camp, which denies time's passage and holds that all events, whatever their temporal location, are ontologically equal.