he golden age of German cinema from 1920 to 1932 produced classics such as "Metropolis," "Nosferatu," "The Cabinet of Dr. Caligari" - and the Kino und Photo Ausstellung (Kipho), a conference for cinema and photography glimpsed here. Held in Berlin in 1925, the show drew hundreds of film-industry exhibitors and 100,000 attendees, who could sit in bleachers watching films being shot on the show floor. Kipho lasted just the one year, but its legacy endured with a six-minute film run in theaters promoting the expo - the first time in history a trade show had its own movie trailer.