In this book, Tonino Griffero introduces and analyzes an ontological category he terms “quasi-things.” These do not exist fully in the traditional sense as substances or events, yet they powerfully act on us and on our states of mind. He offers an original approach to the study of emotions, regarding them not as inner states of the subject, but as atmospheres, that is as powers poured out into the lived space we inhabit. Griffero first outlines the general and atmospheric characters of quasi-things, and then considers examples such as pain, shame, the gaze, and twilight—which he argues is responsible for penetrating and suggestive moods precisely because of its vagueness. With frequent examples from literature and everyday life, Quasi-Things provides an accessible aesthetic and phenomenological account of feelings based on the paradigm of atmospheres.