コブラ、シチュエーショニスト・インターナショナルの創設者、アスガー・ヨルンに出会う。その後、ヨルンの弟、ヨルゲン・ナッシュらが中心となったスカンジナビア・シチュエーショニスト運動に参加。1973年、ウベボダに移り住み、シンポジウムを開催。何百人もの芸術家が世界各国から由夫のもとに集まった。

〈Scandinavian Situationist / Ubbeboda〉Nakajima met Asger Jorn, a founding member of CoBrA and the Situationist International. He introduced Nakajima to his younger brother, Jorgen Nash, who was a central figure of the Scandinavian Situationist group, of which Nakajima became an active member. In 1973, Nakajima moved to Ubbeboda, and started an international symposium on stone sculpture. It became a ‘free commune’ involving hundreds of international artists over a three-year period.