Space Hijackers

The Space Hijackers is a group originating in the United Kingdom that defines itself as "an international band of anarchitects who battle to save our streets, towns and cities from the evils of urban planners, architects, multinationals and other hoodlums". Time Out magazine has described the group as "an inventive and subversive group of London ‘Anarchitects’ who specialise in reclaiming public spaces – usually without permission."

The group's activities have included "guerrilla benching" — restoring benches that had been recently removed and bolting them to the ground — organising a midnight game of cricket in the centre of the City of London financial district, and satirising the glossy architects' drawings that are displayed on the perimeter of luxury apartments by depicting children’s playgrounds and other projects they believe to be actually desirable. Many of these activities aim to bring to people's attention the role which corporations play in society in a different light.

Space Hijacking is mental graffiti, designed to change how the space is perceived and take some of the power away from the people who own or design the space.

The Space Hijackers exist mainly to change the public's perception of spaces it regularly uses, mainly by staging unexpected events. Their explicit objective is "to effect and change the physical space of architecture", and, eschewing violent protest and other forms of transparent direct action, their methods aim "to invade and re-brand corporate space". They believe that the use of physical space is becoming more and more politicised, and thus in order to break apart from that politicisation, they stage events that are typically 'unusual' for that particular space, 'hijacking' it and hoping to change people's perception of the use of that space forever. They believe that increasing politicisation usually leads to increased subordination and discrimination and other forms of domination and control and so Space Hijackers claim to seek to break down and deconstruct society's notions of space. They seek to effect this by attempting to undermine the authority of the owner's "text", confusing and re-contextualising it and thereby making apparent the possibility of an alternative future. Protests tend to be non-violent and Space Hijacker projects usually involved a good sense of fun. Protest strategy includes involving passers-by.

...
Wikipedia