Artforum is to art what Vogue is to fashion and Rolling Stone was to rock and roll. It’s a trade magazine with crossover cachet and an institution with controversial clout. In an episode of Sex and the City, the relationship between the characters played by Sarah Jessica Parker and Mikhail Baryshnikov is starting to falter. How do we know? He’s reading a copy of Artforum in bed. Likewise, when Bart Simpson becomes an artist and opens a galley in his treehouse, how can we he sure of the enfant terrible’s success? He’s featured on the cover of Bartforum.