If I picked up a paintbrush, dipped it in a can of black semigloss and painted a square on the wall, would that be art? Obviously not, even if I were extra careful not to drip. So when Russian artist Kazimir Malevich painted a black square on canvas in 1915, was that art? Not only was it art, son, it was the seminal work of the Russian Suprematist school. That raises the question: "Who gets to call it art?" In the documentary film of the same name, director Peter Rosen gives us the answer: people like Henry Geldzahler, the New York Museum of Modern Art curator that first deemed Andy Warhol's soup cans exhibit-worthy. Here's another question: "Who gets to call Rosen's film 'glib, largely uninformative and poorly organized'?" That would be The New York Times. Don't let that stop you, thoughif you didn't like glib, etc., you wouldn't be reading this anyway. The film, part of the Magnolia at the Modern series, is showing Friday through Sunday at The Modern Art Museum of Fort Worth, 3200 Darnell St. Tickets are $7.50. Call 817-738-9215, ext. 154, or visit themodern.org.