Having just spent a weekend on the Minneapolis-St. Paul skyway system, I was ripe for Gary Burns' waydowntown, in which four corporate types ask the philosophical question, How long can we go without stepping outside? Set in one of those building complexes that contain offices, apartments, restaurants, boutiques and a maze of escalators, this wonderfully sardonic Canadian film, which comes to us straight from the Wisconsin Film Festival, is a worthy successor to Chaplin's Modern Times. Call it Postmodern Times ' life squeezed into hermetically sealed boxes.