Paolozzi used collage throughout his oeuvre. In the 1960s, he extended this concept into actual interchangability in his sculpture. Each of the nine aluminium elements in this work is movable, so that it can be displayed in a variety of ways. The inspiration for the sculpture came partly from a model the artist had made of a design for a children's playground. This consisted of building blocks that could be moved and climbed on. Paolozzi was always fascinated by children's toy kits, which are also an influence here.