As a result, the building form is articulated in a stepped profile of three individual towers, respectively twenty-nine, thirty-six and forty-four storeys high, which create floors of varying width and depth and allow for garden terraces. The mast structure allowed another radical move, pushing the service cores to the perimeter to create deep-plan floors around a ten-storey atrium. A mirrored 'sunscoop' reflects sunlight down through the atrium to the floor of a public plaza below - a sheltered space, which at weekends has become a lively picnic spot. From the plaza, escalators rise up through the glass underbelly to the banking hall, which was conceived as a 'shop window for banking'.