Garbage dump or gold mine? The German artistic collaborators Martin Kaltwasser and Folke Kobberling see rubbish as a major resource. Their projects colonize public space in the name of recycling and design: Overnight, they can make pavilions, villages of huts and even whole houses appear. In installations, exhibitions and, most frequently, guerrilla architectural interventions, they question the conditions of urban life as determined by privatization. For example, in a 2004 project called -Hausbau, - they built a house in front of West Berlin's infamous Gropius-designed, failed-utopia...

Collaborators since 1998, German artists Folke Kobberling and Martin Kaltwasser (also an architect) have created -amorphous forms out of trash that retain a childlike simplicity in spite of rigorous engineering, - according to the UK's The Guardian. Their -magical, structurally sound and user-friendly- sculptural works make use of repurposed materials, volunteer labor and offbeat public spaces.