This Thursday, just as the trees of the Triangle have relinquished their leaves in concession to another winter, the Nasher Museum of Art at Duke will complete a season-long, wide-ranging series called The Forest in the Machine with a screening of a little-seen cinematic gem. Sergei Parajanov's Shadows of Forgotten Ancestors was produced in the early 1960s, on the far side of the Iron Curtain in the Carpathian Mountains of western Ukraine. Although not as well known as other Soviet-era masterpieces, Parajanov's film--a rustic fable about mismatched lovers--is dear to the hearts of cinephiles and has a reputation for memorably bewitching images of human interaction with the natural world. To be preceded by Der Wald, a five-minute computer-animated short by Hungarian artist Tamas Waliczky. Showtime is 7 p.m. and tickets are $3. Students are admitted free. Call 684-5135 for more info.