Pictures artists staged their own images or copied or cut out others already in existence. The viewer took them in separately, in sometimes paradoxical waves: an original image, then the manipulations of it, then the places where image and idea intersected. This created a crucial perceptual glitch that irony and understanding filled.

Almost all institutions own a lot more art than they can ever show, much of it revealing for its timeliness, genius, or sheer weirdness.

I don't want to hear at all what the artist thinks about his art. And I'm not writing for the artist. I'm writing for the reader, and I want to tell the reader what I think.

Anyone who relishes art should love the extraordinary diversity and psychic magic of our art galleries. There's likely more combined square footage for the showing of art on one New York block - West 24th Street between Tenth and Eleventh Avenues - than in all of Amsterdam's or Hamburg's galleries.

'Untitled' is a time machine that can transport you to 1992, an edgy moment when the art world was crumbling, money was scarce, and artists like Tiravanija were in the nascent stages of combining Happenings, performance art, John Cage, Joseph Beuys, and the do-it-yourself ethos of punk. Meanwhile, a new art world was coming into being.

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.

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.