In this groundbreaking work, the author explains Heidegger's famous tool-analysis and then extends it beyond Heidegger's narrower theory of human practical activity to create an ontology of objects themselves. A welcome alternative to the linguistic turn that has dominated recent analytic and Continental philosophy, Tool-Being urges a fresh and concrete exploration into the secret contours of objects. Written in a lively and colorful style, it will be of interest to anyone open to new trends in contemporary philosophy.