Film in the 20th century it's the American art form like jazz.

Early-twentieth-century abstraction is art's version of Einstein's Theory of Relativity. It's the idea that changed everything everywhere: quickly decisively for good.

It is not possible to overstate the influence of Paul Cezanne on twentieth-century art. He's the modern Giotto someone who shattered one kind of picture-making and invented a new one that the world followed.

Advertising is the greatest art form of the 20th century.

Ads are the cave art of the twentieth century.

Today's developer is a poor substitute for the committed entrepreneur of the last century for whom the work of architecture represented a chance to celebrate the worth of his enterprise.

Rome has not seen a modern building in more than half a century. It is a city frozen in time.

Each of us have things and thoughts and descriptions of an amazing universe in our possession that kings in the 17th Century would have gone to war to possess.

All of Koons's best art - the encased vacuum cleaners the stainless-steel Rabbit (the late-twentieth century's signature work of Simulationist sculpture) the amazing gleaming Balloon Dog and the cast-iron re-creation of a Civil War mortar exhibited last month at the Armory - has simultaneously flaunted extreme realism idealism and fantasy.

Half a century ago the amazing courage of Rosa Parks the visionary leadership of Martin Luther King and the inspirational actions of the civil rights movement led politicians to write equality into the law and make real the promise of America for all her citizens.

The question is what will Mitt Romney do as president if his policy is simply to be hands off and let the government be made so small it can be drowned in a bathtub. In the 21st century global economy no state alone has the ability to compete against China.

The 19th century was the age of Individualism the 20th and 21st are the ages of Socialism.

I feel the 21st century is another new age. Not only can we collaborate again with nature but we have to. It's an emergency.

There are signs that the age of petroleum has passed its zenith. Adjusted for inflation a barrel of crude oil now sells for three times its long-run average. The large western oil companies which cartellised the industry for much of the 20th century are now selling more oil than they find and are thus in the throes of liquidation.

In every age there has been a stream of popular opinion that has carried all before it and given a family character as it were to the century.

What is wrong with the Iranians in addition to the nuclear bomb? This is the only country on Earth in the 21st century that has renewed imperialistic ambitions. They really want to become the hegemon of the Middle East in an age that gave up imperialism.

You'd think that in this age especially in the 21st century - especially with all the technology and all the discoveries that we've made - that we would figure out how to tackle abuse.

If the nineteenth century was the age of the editorial chair ours is the century of the psychiatrist's couch.

We have entered an age in which education is not just a luxury permitting some men an advantage over others. It has become a necessity without which a person is defenseless in this complex industrialized society. We have truly entered the century of the educated man.