Tschumi's Alfred Lerner Hall is a turbulent mixture of the conventional and the innovative. Its opaque, masonry-clad wings respond to the traditional materials and massing of the Columbia University campus, while its transparently clad middle develops as a spectacular multitiered system of glass ramps. Designed in collaboration with a team of engineers, including Hugh Dutton, the glass ramps and the glass wall are intersupporting. Together they form a central hub of circulation, an event
space that registers the dilation and contraction of structural and social flows.