In 1968 Palle Nielsen approached the Modern Museet in Stockolm with a proposal for turnig the museum into an adventure playground. From 30 September to 20 October 1968 Modellen. En Modell för ett kvalitativt samhälle (The Model-A model for a Qualitative Society) was installed and children under eighteen were offer ed free access. The event attracted more than 35,000 visitors. Nielsen´s insistence on using the