The onscreen action (or non-action) is synced up to the actual time, so if you see a shot onscreen of a clock tower showing 4:45 p.m., you know it's 4:45 p.m. in Minneapolis.

The clocks in each clip document the time throughout the 24 hour movie ... Marclay’s The Clock—a massive and impressive video supercut now at the Museum of Modern Art in New York—is ...