Appropriation is the idea that ate the art world. Go to any Chelsea gallery or international biennial and you'll find it. It's there in paintings of photographs, photographs of advertising, sculpture with ready-made objects, videos using already-existing film.

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.

The debut show, “Second Lives: Remixing the Ordinary,” is supposed to be about how artists reuse humble or unusual materials. There’s good work here, but much of what’s on view is actually more about obsession and repetition: a couch made out of 3,500 quarters, a necklace composed of 100 handgun triggers. The building, too, seems caught between wanting to be an object of decorative delectation and making an architectural statement.

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.

Kinkade's paintings are worthless schmaltz, and the lamestream media that love him are wrong. However, I'd love to see a museum mount a small show of Kinkade's work. I would like the art world and the wider world to argue about him in public, out in the open.

The Metropolitan Museum of Art is unsurpassed at presenting more than 50 centuries of work. I go there constantly, seeing things over and over, better than I've ever seen them before.

I see around 100 shows a month, going from Niketown-size palaces where you feel like yelling, to storefronts in Bushwick. Each has to pay the bills; keep artists happy; and cope with collectors (oy!), curators (ay-yi-yi), critics (woo-hoo!), and occasionally plumbers. That their fiscal life often hangs in the balance only adds to the energy.