In Gaston Bachelard addresses the nature of time in response to the writings of his great contemporary, Henri Bergson. The work is motivated by a refutation of Bergson’s notion of duration – ‘lived time’, experienced as continuous. For Bachelard, experienced time is irreducibly fractured and interrupted, as indeed are material events. At stake is an entire conception of the physical world, an entire approach to the philosophy of science. It was in this work that Bachelard first marshalled all the components of his visionary philosophy of science, with its steady insistence on the human context and subtle encompassing of the irrational within the rational. reaches far beyond local arguments over the nature of the physical world to gesture toward the building of an entirely new form of philosophy.