Think of a place: a locality, a city, a town. Think of a group of people, who may or may not be from this place; who appear and congregate at a central point. They bring tents and sleeping units for shelter and protection against the elements, audio-visual displays and mobile technologies for communication, and forms of speech, music and art, forming a kind of culture of their own. Above all, they bring signs. Banners proclaiming their interests, beliefs and ideals, declarations embedded in their music and art, thoughts expressed in the shared slogans and turns of phrases they collectively seem to understand. Even the presence of the group itself in this place is a sign of their existence to the other residents. This existential reminder is important—their aim is to use the shock of their presence to jolt the existing inhabitants of the place, taking the first step towards a larger goal.