The popular mythology of creative genius depends on beloved stereotypes of the artist in youth and old age: the misunderstood upstart who forces us to see the world afresh; and the revered sage who shows us depths of insight attainable only through a lifetime of hard-won experience.

What a museum chooses to exhibit is sometimes less important than how such decisions are made and what values inform them. To have the crucial role of museum professionals usurped by self-serving tycoons in the name of economic imperative threatens not only the integrity of individual institutions but the very principle of art held in public trust.

Before World War II, Modernist architects sometimes had to resort to custom fabrication or outright fakery to achieve the machine imagery advocated by the Bauhaus after its initial, Expressionist, phase. Stucco masqueraded as reinforced concrete; rivets were used for decoration.

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.

One of the Age of Enlightenment's most hypnotic images is Ledoux's rendering of his neoclassical theater of 1775 - 1784 in Besancon, surreally reflected in the colossal eye of an unidentified cosmic being.

The magnificent lobby of the Chrysler Building - faced with rare marbles, aglitter with decorative metalwork, and surmounted by a ceiling painted with a totemic image of the tower itself - leads to elevator cabs inlaid with exotic woods in fanciful patterns. The entire route from street to office is invested with ceremony, dignity, and delight.

When Oscar Niemeyer died on December 5, 2012, ten days before his 105th birthday, he was universally regarded as the very last of the twentieth century's major architectural masters, an astonishing survivor whose most famous accomplishment, Brasilia, was the climactic episode of utopian High Modern urbanism.