There’s no mistaking the tone and structure of a film by the 81-year-old Georgian director Otar Iosseliani: caustic, mordant, detached, extremely funny, and dizzyingly panoramic. Like several of his earlier films, Winter Song doesn’t center on a single figure so much as a dense cluster of interrelated characters, all united by objects (an executed aristocrat’s skull), places (the apartment building where most of them live), historical events (from the French Revolution to the Russo-Georgian War), and pure coincidence. An aging upper-crust patriarch burning his letters; a tramp hoping to avoid the advances of a steamroller; an 18th-century nobleman who insists on taking his pipe to the guillotine: Winter Song is a well-stocked encyclopedia of human variety, eccentricity, and folly, elevated by an exquisite cast that include Rufus, Pierre Étaix, and Mathieu Amalric.