In Gestures of Concern Chris Ingraham shows that while gestures such as sending a “Get Well” card may not be instrumentally effective, they do exert an intrinsically affective force on a field of social relations. From liking, sharing, posting, or swiping to watching a TED Talk or wearing an “I Voted” sticker, such gestures operate as much through affective registers as they do through overt symbolic action. Ingraham demonstrates that gestures of concern are central to establishing the necessary conditions for larger social or political change because they give the everyday aesthetic and rhetorical practices of public life the capacity to attain some socially legible momentum. Rather than supporting the notion that vociferous public communication is the best means for political and social change, Ingraham advances the idea that concerned gestures can help to build the affective communities that orient us to one another with an imaginable future in mind. Ultimately, he shows how acts that many may consider trivial or banal are integral to establishing those background conditions capable of fostering more inclusive social or political change.

With machines mediating most of our cultural practices, and innovations, obsolescence and revivals constantly transforming our relation with images and sounds, media feel more unstable than ever. But was there ever a ‘stable’ moment in media history? *Inventing Cinema* proposes to approach this question through an archaeology and epistemology of media machines. The archaeology analyses them as archives of users’ gestures, as well as of modes of perception. The epistemology reconstructs the problems that the machines’ designers and users have strived to solve, and the network of concepts they have elaborated to understand these problems. Drawing on the philosophy of technology and anthropology, *Inventing Cinema* argues that networks of gestures, problems, perception and concepts are inscribed in vision machines, from the camera obscura to the stereoscope, the Cinématographe, and digital cinema. The invention of cinema is ultimately seen as an ongoing process irreducible to a single moment in history.