Works of art often last forever, or nearly so. But exhibitions themselves, especially gallery exhibitions, are like flowers; they bloom and then they die, then exist only as memories, or pressed in magazines and books.

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.

Many museums are drawing audiences with art that is ostensibly more entertaining than stuff that just sits and invites contemplation. Interactivity, gizmos, eating, hanging out, things that make noise - all are now the norm, often edging out much else.

The greatest work of art about New York? The question seems nebulous. The city's magic and majesty are distilled in the photographs of Alfred Stieglitz and Paul Strand.

In the seventies, a group of American artists seized the means not of production but of reproduction. They tore apart visual culture at a time of no money, no market, and no one paying attention except other artists. Vietnam and Watergate had happened; everything in America was being questioned.

I like something about George W. Bush. A lot. After spending more than a decade having almost physiological-chemical reactions anytime I saw him, getting the heebie-jeebies whenever he spoke - after being sure from the start that he was a Gremlin on the wing of America - I really like the paintings of George W. Bush.

Think of an abstract painting as very, very low relief - a thing, not a picture.