This is one of the first works that Gabo made with the newly invented plastic, Perspex. Gabo found that Perspex was easier to manipulate and bend than other plastics that he had previously worked with. It is a superb example of constructivist sculpture, which is made by combining separate elements, instead of using traditional techniques, such as carving or modelling to create a single form. There are two other versions of this work, one with a black centre and one with a white centre. The work conveys an abstract sense of energy and movement, with planes springing dynamically from the central black area.