For the past six years Willi Kopf has been building geometric cubes and rectangular forms out of untreated, standard-size sheets of chipboard. Kopf systematically saws them up and glues them together into rectangular shapes of different sizes that look as if they were meant as a playhouse for children. In fact, he is producing modulelike construction units for a process of assemblage in which calculation and chance play equal roles. These rectangular boxes, which he calls “brick elements,” are glued together and placed inside one another until at last they produce the finished sculpture, without