The contribution of the Dutch craftsman and scholar Isaac Beeckman to early modern scientific thought has never been properly acknowledged. Surprisingly free from the constraints of traditional natural philosophy, he developed a view of the world in which everything, from the motion of the heavens to musical harmonies, is explained by reducing it to matter in motion. His ideas deeply influenced Descartes and Gassendi. Klaas van Berkel has succeeded in unearthing and explicating Beeckman's scientific notebooks, allowing us to follow how he developed his new philosophy, almost day by...