The University of Sydney's new Business School is designed to inspire the next generation of economic leaders. The centrepiece of the new purpose-built Abercrombie Building is the unique spiral staircase - Stair 4. Looking like an art piece, this staircase begins at basement level and forms a volute as it ascends to the atrium on Level 6. The diameter of each level narrows from 12m at Level 1 to 6m at its apex - resulting in a visually striking feature that is technically complex in its form and geometry.