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.

There can be little question that the tall building presents one of the most difficult challenges to the architect.

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.

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.

Cost overruns are not uncommon in architecture, particularly for designs that depart from structural or technological norms, or demand a finer quality of execution than commercial schemes - conditions typical of buildings for cultural institutions. Budgets are exceeded for many reasons, not all of them within an architect's control.

Few developments central to the history of art have been so misrepresented or misunderstood as the brief, brave, glorious, doomed life of the Bauhaus - the epochally influential German art, architecture, crafts, and design school that was founded in Goethe's sleepy hometown of Weimar in 1919.

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