The document discusses the principles of form following function and circulation in building design. It provides the Sydney Opera House as a case study, describing its iconic shell-like form which was designed based on the functional requirements of the performance spaces. The form uses pre-cast concrete rib segments and tensioned steel cables to support the shells. It also examines the Guggenheim Museum, whose spiral design was intended to allow visitors to view the artwork along an ascending walkway, making the building itself a work of art.