It is clear that an ever-widening array of everyday spaces now double as venues for multimedia authorship. Writers, activists, and students, in cities and towns everywhere, are digitally augmenting physical environments. Audio walks embed narratives around local parks for pedestrians to encounter during a stroll; online forums are woven into urban infrastructure and suburban plazas to invigorate community politics. This new wave of digital communication, which Tinnell terms "actionable media," is presented through case studies of exemplar projects by leading artists, designers, and research-creation teams. Chapters alter notions of ubiquitous computing through concepts drawn from Bernard Stiegler, Gregory Ulmer, and Hannah Arendt; from comparative media analyses with writing systems such as cuneiform, urban signage, and GUI software; and from relevant stylistic insights gleaned from the open air arts practices of Augusto Boal, Claude Monet, and Janet Cardiff. Actionable Media challenges familiar claims about the combination of physical and digital spaces, beckoning contemporary media studies toward an alternative substrate of historical precursors, emerging forms, design philosophies, and rhetorical principles.