quadric surface

One of the most interesting mathematical forms for architects, since mid-20th century is the Quadric Surface equation of Hyperbolic Paraboloid. Erik Demaine has put a short biography together in his website. According to him; Hypars and joining hypars in a few special ways have been used extensively in architecture. For example, Curt Siegel’s 1962 book Structure and Form in Modern Architecture (page 256) illustrates the roof of the Girls’ Grammar School in London (designed by Chamberlin, Powell, and Bonn) which is what we call a “5-hat” with five hypars spread apart slightly. […]