The elliptical building form is articulated as a number of individual cogwheels with the teeth projecting radially in the form of a fin. Each cog is extruded over two floors and separated by aluminium clad spandrels to allow each cog to be read individually within its overall composition. Each alternate double height floor plate is offset to the levels above and below to provide the illusion of rotating cogwheels. The fins are formed of painted metal tubes set in square plates top and bottom with the top plate turned through 90 degrees. The inner skin of the façade is a unitised system with golden effect mullions and transoms which provide a contrast against the dark fins.