Espen Hammer's exceptionally fine book explores modern temporality, its problems and prospects. Hammer claims that how people experience time is a cultural/historical phenomenon, and that there is a peculiarly modern way of experiencing time as a series of present moments each indefinitely leading to the next in an ordered way. Time as measured by the clock is the paradigmatic instance of this sense of time. In this perspective time is quantifiable and forward-looking, and the present is dominated by the future. Hammer argues that this manner of experiencing time provides a way of living that brings with it not only the basis for great successes in technology, but also great costs-specifically, what he calls the problems of transience and of meaning. Hammer goes about his task by considering the ways some of the great modern philosophers have characterized present-day temporality and have responded to the problems he has identified. Specifically, he considers what Kant, Hegel, Schopenhauer, Nietzsche, (early) Heidegger, Habermas, Bloch, and Adorno provide in response to our peculiarly modern predicaments. The book is remarkable for its clarity and perceptiveness, but in the process in crucial places it simplifies the matters at hand or fails to push its insights as far as it ought, and in the end promises more than it can deliver. In this it betrays a rationalist confidence in the power of reason that founders on what in many ways remains a mystery.