Experimental architecture by its very nature is more prone to the depredations of time and natural elements than buildings made from conventional materials through traditional methods. Avant-garde architects often simply do not know how the products of their imagination will perform when implemented, especially if untested components are involved.

The work that launched Snohetta into the architectural big leagues was their Oslo Opera House, which will certainly rank among the firm's highlights whatever else they may do. Although this is by any measure a triumph of city planning, the building itself is not quite a masterpiece, though very fine indeed.

Winning the Pritzker assures a flood of work in one's seventies and eighties, jobs necessarily carried out by assistants as the demands of modern-day cultural stardom and the inevitable waning of physical capacities prevent many architects from attaining the transcendent final phase more easily achieved by artists in other mediums.

One of the most persistent yet elusive dreams of the Modern Movement in architecture has been prefabrication: industrially made structures that can be assembled at a building site.

Although prefabrication has a long history - the ancient Romans shipped pre-cut stone columns, pediments, and other architectural elements to their colonies in North Africa, where the numbered parts were reassembled into temples - the idea took on a new impetus with the technological advances of the Industrial Revolution.

One of the stated goals of the postmodern movement in architecture was a greater sensitivity to the people who live in or use newly designed buildings.

The skyscraper style first advocated by Louis Sullivan - a tower of strongly vertical character with clear definitions among base, shaft, and crown - has remained remarkably consistent throughout the history of this building type.