摘要：Guerilla Gardening, Reclaim the street, Adbusting and others are characteristic forms of tem-porary appropriation of public spaces. Those have become a global trend.Urban open spaces should not only be thought of as stable constructions in a planned and built environment. Their significance lies on a metaphoric and symbolic level and thus allows to ‘mentally roam’ them. These spaces lack certain rules; those are made invalid for a certain time. Hackings actually exploit these gaps by playfully interfering into structures in public spaces. They aim at re-orientation and/or disorientation. Urban open space becomes a testing field for temporary, individual appropriations of space, artistic reinterpretations of the ordi-nary and trivial. Despite their manifold shapes, hackings follow certain basic principles, such as the claim to constructively produce urban structures rather than destroy them deliberately. Acknowledging these assumptions, practical field trip concepts will have prolific effects on geography classes
关键词：mapping; field work; hacking; exclusion; urban geography
