This book looks at the future of advertising from the perspective of pervasive computing. Pervasive computing encompasses the integration of computers into everyday devices, such as the covering of surfaces with interactive displays and networked mobile phones. Advertising is the communication of sponsored messages to inform, convince, and persuade people to buy. We believe that our future cities will be digital, giving us instant access to any information we need everywhere, like at bus stops, on the sidewalk, inside the subway, and in shopping malls. We will be able to play with and change the appearance of our cities effortlessly, such as making flowers grow along a building wall or changing the color of the street we are on. Like the internet as we know it, this digitalization will be paid for by advertisements, which unobtrusively provide us with suggestions for nearby restaurants or cafés.