Jeff Koons: Gazing BallHailed by Peter Schjeldahl inThe New Yorkeras the most original, controversial, and expensive American artist of the past three and a half decades, Jeff Koons has come to reign as a master of the market, a wry puppeteer with a formidable aesthetic intelligence. His elaborate, exquisitely produced sculptures draw from a contemporary lexicon of consumerismoften featuring large scale reproductions of toys, household items, or luxury goodswhile