Event which has taken place every ten years since 1977 in Münster, a university town in north-west Germany, in which artists are invited to work in public spaces. The results tend to be site-specific installations rather than sculpture in the traditional sense. For instance, in the first event Michael Asher arranged for a caravan to be parked in various places: it was a typical gesture by this artist to make a work which was barely perceptible as art. Other artists who took part in 1977 included Carl Andre, Joseph Beuys, Richard Long, Claes Oldenburg, and Richard Serra. In 2007 the most impressive contribution was generally found to be Guillaume Bijl's buried cathedral spire.