All architecture, classical or not, must have some sense of order, and order is much harder to achieve without the straight lines and right angles that have dominated the building art from time immemorial.

The truth be told, the World Trade Center was neither a very good work of architecture nor a very successful piece of urbanism. Its shortcomings were somewhat mitigated by the westward and southward expansion of the World Financial Center and Battery Park City during the 1980s.

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.

As with many other folk beliefs, 'feng-shui' undoubtedly incorporates some scientifically correct observation or received wisdom based on direct experience of natural phenomena; but it needs to be dealt with skeptically as a credible system of thought. Some feng-shui prescriptions can certainly lead to desirable results.

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.

Architecture is not a profession for the faint-hearted, the weak-willed, or the short-lived.

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.