Party at Constant's studio

Party at Constant's studio at Derde Wittenburgdwarsstraat in Amsterdam. On the right Roel van Duijn the initiator of Provo. On the left front, turned around in his chair is Johnny, Constant's welding assistant. In the background the drawing Sektor-BR-SUR-57, 1966 and the construction Mobile Ladder Labyrinth, 1967.